I've been using this system for about a year and it has been working great. I have it protecting Leitz CMM and it has filtered this system from major power interruptions. My focus has been on the interruption and/or surges and not so much as a backup. Since putting it online I haven't had a single system failure. The only reason why I gave it a 4 star rating is that the software the comes with this system doesn't work that great. I tried using it to monitor the incoming power. The software doesn't let you customize it and is confusing at times. Also the software kept locking up or stopped communicating with the SU3000XL system. I finally removed it from my computer.
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