After all I said earlier about buying blind and having some success, there is one bike I was very glad to have test ridden before buying.
In 2003, after having sold my S-Works Enduro frame cos I wanted something slightly beefier, I was dead set on getting a Cove G Spot cos they looked awesome. Anyway, got a demo on one in my size, it fitted perfectly, the geometry felt spot on, the bike was gorgeous… But it was without doubt, the single worst full suspension design I have ever ridden, because the pivot around the BB totally isolates the suspension from any feedback at all, and so the bike just wallows constantly. Every pedal stroke uphill it would dive through more than half its travel! IT WAS HORRID!
Ended up buying a Santa Cruz Bullit instead (a blind purchase), after having previously ridiculed the high forward single pivot suspension design, and it ended up being one of my favourite bikes ever!