The golden rule with UPS's is that they should use standard format batteries. I've always used Merlin Gerin, because they use standard motorbike or car batteries, and are very easily serviceable. They are also available as manageable UPS's and are compatible with everything in the enterprise world (RS-232, RJ-45) and the SOHO world (USB).
MGE and APC are now both owned by Schneider Electric, and chances are they are basically the same products, so I don't think it makes much difference. MGE and APC are the market leaders, and with reason, you can use these with any worries for just about any UPS or power stabilisation application.
UPS's contain lead acid batteries, so they are bloody heavy, and need ventilation. Just saying, don't let them run on a shelf of an Ikea Billy under a stack of papers. UPS's also have forced cooling, so they make noise.
If you're looking at something really cheap, check out the Trust Oxxtron series. These are specifically made for SOHO applications, and operate on standard motorbike batteries. The managed versions do make a bit of noise though because the fans are really small. A common hack is to put a regular case fan on them to ensure airflow fron side to side through the side vents on both sides, and to disconnect the internal fan at the back. If you're in Europe, these UPS's, notwithstanding the fact that they're cheap, provide a lifetime 25k EUR guarantee against broken hardware in case the UPS fails. But I've never seen them fail in the 6-7 years that I've been recommending Trust UPS's for home use. (http://www.trust.com/en/product-ranges/ups)
It should be clear though that these cheap UPS's do not have the regulating ability and quality of enterprise grade UPS's... also just saying.
Most cheap UPS's besides the above, are more of a security risk than a security feature to be honest. A UPS is not a toaster, it's basically a stack of DC lead-acid batteries and an inverter, with a power regulation circuit. There is serious potential for disaster if it's not manufactured with care and good parts. Even a slight tolerance to reduce the cost of the unit, can cause the batteries to vent, which produces a mixture of oxygen and hydrogen, which is not something you want near a high voltage relay circuit...