They don't look bad. The thing you have to look for is the quality of the bearings that he's using, that will make the biggest difference. If you can see them in person ask if you can see the assembly process, check the fitting of the parts, quality of materials and workmanship, and the bearings.
Honestly? You probably get what you pay for, but if this guy is starting a company building this stuff he's going to be priced cheaply to begin with. Is it going to be Gilles level quality? Doubtful, but it's most likely going to be better than stock.
__________________
Entia non sunt multiplicanda necessitatem
|