From personal experience (I run an IT support company), I can't recommend any of the Eaton/PowerWare UPS units. They fail far too frequently. I think around 5-6 units per 12 months on average. Although I get replacements under warranty, I now direct clients to purchase APC units which have never failed me in ~10 years. For around 15% additional cost for a comparable UPS, it's definitely worth it in the long run.
For obvious reasons, this is my opinion of my own experiences. Take what you wish from my ramblings
