I actually just switched (perhaps entirely) from Xbox to PC, and built my first computer as well as a R3volution two weeks ago.
Moving from a CSR-E/CSP V1 + Rennsport Wheelstand + couch to my new CSW/CSP V2 + Obutto R3volution has been a revelation. As far as value, given my circumstances, it was absolutely worth it. The R3volution is, in my view, very well constructed. The carbon steel is appears to be of good quality, and its design is well-conceived. I haven't yet noticed any problematic aspects that can't be redressed with a little ingenuity. That's always important to me. With big-ticket items, especially those that will see a lot of use (e.g. bed, computer, TV), having to deal with drawbacks is very annoying. But obviously, had my R3volution purchase entailed subsequent starvation, or even huge compromises in other gaming rig areas, I would obviously not consider it "worth it". That, of course, doesn't reflect on the R3volution itself, but is important to consider. FWIW, although I haven't priced out its components, the R3volution does not appear to be any sort of cash grab. Neither is it burdened by licensing deals that increase price, but are valueless to consumers (e.g. Playseats). From all I've gathered, both the Ozone and R3volution are primarily labors of love, and priced closer to cost than many competitors. While that is conjecture, Chris really does seem most interested in getting his products into the community.
That said, the Ozone appears to offer quite a bit of the R3volution experience for around half the price. TBH, I'm sure I would be quite satisfied with the Ozone, but I'm afflicted by "top-of-the-line-itis". A marketer's dream, but pathetic, really.
Building the R3volution was rather difficult IN A FEW SPECIFIC PLACES, but without the seven part video instructions, would have been nearly impossible. However, I don't have much experience with such endeavors. In fact, I learned a lot, and the sense of accomplishment upon completion was significant.
As Chris notes in the first video, there are a few flanges that will likely require extra effort to properly join. Notably the left and right sides of the R3volution front join their respective bottom skids via flanges that required immense patience and ingenuity to affix. Given the very small tolerances necessary for the remarkably stable chassis, the flanges must literally envelope the skids with nary a millimeter of gap, or the holes won't line up. At the time, I almost drilled out the wholes a bit, as they are less than a millimeter wider than the bolt itself, but I'm glad I persevered. Perhaps the R3volution's most useful feature is its notable inflexibility, which directly stems from these masochistic tolerances. With that in mind, I purchased a small spanner (11 3/4" IRRC) and used it as a vice of sorts to carefully tighten the flange around the skid. Thankfully, bolting the skids onto the chassis sides proved to be the most difficult aspect of the build. Somewhat ironically, it is basically the first step in the R3volution assembly.
Watching the relevant video prior to each step allowed me to easily visualize the assembly, and subsequent that prolonged first step, building the R3volution ran about 4 hrs. Of course, I took my time and made sure I understood - in its entirety - what I was doing each step. I also took frequent breaks.
Finally, the R3volution's largest shortcoming, for me, remains the monitor stand. The freestanding unit straddles the chassis on wider skids, but the crossbar unit that both affixes the monitor and connects the stand's legs doesn't bolt to those legs. This allows each leg to rotate freely, and is intended, ironically, as a feature. Some may then enjoy this design choice, but I've found my 27" monitor moves too much, and the skids are very difficult (for me) to place in parallel. IMO, the monitor stand both moves too much and is not as aesthetically pleasing as a more rigid stand. Finally, for many the stand's biggest issue may lie in adding wing monitor's. Apparently, many have had great difficulty lining up triple monitors properly. As I'm currently running a single 1440p display, I haven't encountered this, but for those who have, it has been distressing.
With the above in mind, I actually ordered a custom triple mount monitor stand from Mark Lutes of Fast Track Sims (fasttracksims.com). It may have been on GT Planet that I became aware of the stand, but in any case, from what I've read, it's the best available. As it has not yet arrived, I can't provide my own opinion yet, but I do have high hopes. At nearly $400, however, it certainly isn't cheap. I'm hoping to sell my R3volution monitor stand eventually, but that won't bring more than $100.
Ironically, while waiting for the custom stand, my original stand has functioned much better than expected. So much so, that I really don't need the custom stand. I'm not upset, as I think the custom stand will provide a better solution, but if I'm honest, doing it all over I'd definitely keep the original.
Sorry for the long-winded reply, but hopefully I've provided at least some of the types of insights you're looking for. Please let me know if you have any further questions or concerns you'd like addressed.
Henk
I do have a playseat evolution with a G27. I do find the seat kind of uncomfortable at points. Especially the butt cushion, and the back rest.
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thanks guys for your replys! 
