Although I personally prefer the Buick Reatta to the Allante, as an engineering exercise, it does muster at least a cool from me. Certainly, original models were a little less than pleasing, but, as many GM cars from that era can prove, the year-over-year revisions eventually came to produce a car that was pretty damn good.
The Allante helped pioneer magnetic ride control, side airbags, integrated cell phones, as well as being the first application of traction control on a front-drive vehicle, and herald the beginning of the Northstar era in its final model. That's pretty cool. But, GM was the first with a lot of things, all of which they seemed to promptly drop and move on to a product that was significantly worse. As our generation gets a little older, I think a lot of late '80s, early '90s GM (and Ford and Chrysler) vehicles will start to increase in popularity and value, perhaps not entirely for nostalgic reasons, but because they were cool in a weird way. The Allante, Reatta and Toronado Trofeo all fit in that group, along with the high-performance Chevrolet Beretta GTZ and Oldsmobile Cutlass Calais 442.