I put in a Genie screw-drive type about 5 yrs. back. It has not given me any problems - actually, a short story that I think shows they are built pretty tough....
The torsion springs my double-door uses wound up breaking earlier this year. (bad. /w3tcompact/icons/sad.gif) How long were they broken? I can only guess - but I believe it was probably for a fair amount of time - maybe a month or 2. Anyway, the door opener kept working so well, I didn't notice it until I was in the garage one day with the door closed and happened to look up. Needless to say, once I discovered it, I didn't use the door opener until I repaired it.
(BTW it is almost impossible to find someone to sell you those torsion springs as everyone claims they "can't" due to liability reasons - While yes, there is a certain amount of danger involved in tightening such a heavy-duty spring, I think it's more of a "racket" the door companies have set up as there are FAR more dangerous things out there. <power tools, chainsaws, etc. anyone?> Don’t get me wrong, I’m sure there are plenty of folks who have hurt themselves when installing such springs, but there are plenty of folks who have cut off body parts with a circular saw or died while felling a tree with a chainsaw too.)
Anywho, I felt bad that "Genie" was abused, but am happy it held up well. Other brands? Can't comment from first hand experience, but I haven't heard anyone complain about them either.