Interesting site. So they are basically taking wrecked bikes and piecing them together to form whole ones. My main concerns would be whether the whole bike ends up with a salvage title. This can make the bike harder to insure and hugely lowers the resale value for the life of the bike. I’d also be a bit worried about whether there was crash damage that was undetected or ignored (buyer beware issue).
Another thing I noticed is that some of the posted prices don’t look all that great. I would expect to pay significantly less than $2k for a Seca II with 40k miles, especially with a salvage title.
All that said, it might be worth a visit just to see lots of used bikes in one spot.