My 7800gt is a jaton card, its a replacement for my 6800 ultra which after a year i found that it had a second dvi port brocken (all red), so i sent it back and got the 7800gt.
They are not too bad, but i donno, up to u...
My 6800 ultra was in fact brocken from factory (faulty bios, dvi port, they had no idea how i managed to use it for 1 year

), in fact they did not make it, it was a refrence card so not their fault really.
From what i've seen they are overpriced, but besides that i dont see any particular problems with their quality, although i would trust other brands like asus, msi etc anyday over jaton.
EDIT: also i had 3 years warranty, thats probably the only reason i got the card, still have 1.5 years left

... so i'm happy with it, if it breaks i get another one for free... also no shiping cost, done it through a local shop. So for me it was convenient to buy it, donno how it would be for u. (if i had a choice to buy it again, well i donno getting a free 7800gt was rather sweet)