I have a BR700G it works flawlessly with apcupsd, minimal to no configuration... the cheap units of APC is for really really desperate consumers, the battery didn't last more than a year from my experience like the BR* ones that usually last 3 years, these lines is the better of the both worlds cheap and sophisticated enough to work "smart" but as expensive as the SMT/SMC units.

Also like everyone say... remember to look for pure sine wave output if you are going to "protect" servers, for network equipment you could use the pwm based ones.