Premature failures were a serious problem when we had about $250k worth of their gear in several datacenters. Even though they would make good on them, it was a huge pain in the ass to deal with the frequent replacements of batteries and circuit boards. We ultimately donated all of the gear to charitable organizations (hopefully, they had better luck than we did) and replaced everything with APC gear. And the APC stuff just plain worked. No muss...no fuss....but more importantly, no failures.

Cheers,