They are not very refined, and technically far from worth their asking price. Many of them feel very half baked, and the GSi/GTE for example, is pretty much undrivable in original form.
The main reasons for buying them are that the models are actually scratch made and pretty good, and nobody else makes the cars he does. Which is very annoying for people like me, who are heavily into 80's touring cars.. There aren't really any options, other than some poorly ripped free mods circulating.
Compared to cars like VRC's supertourers, there isn't even any point in comparing, they eclipse Tommy's cars around the moon and back. At about the same price.
So yeah, I kind of agree, they aren't really good enough to pay what he asks, but in lack of other options I support Tommy's work anyway.
I'm changing the tyres for a lot of his cars, and that alone kicks new life into many of them. They're equipped with tyres like 245/15-R19.5, which is pretty much like driving with wooden wheels. More appropriately sized rims and a bit more tyre flex obviously does them good.