Good specs and pricing, and have had good luck with APC products previously. Appears to be working OK. A few problems: (1) User manual needs improvement: refers to software available online, but APC does not provide software for Mac OS X; (2) User manual has sometimes confusing terminology, needs editing by an inexperienced user; (3) cannot plug my disk drive transformer into either backup outlet directly - one is too close to the master outlet, and the other is too close to the power cord - I had to use a cube tap to space the transformer away from the chassis.
Like the adverts say, this UPS+backup has 10 outlets, energy saving design, runtime, and a system of Master-Controlled outlets. I have used only APC for computers for 2 decades, without any damage and a good number of little saves. The 750ES is very competent, with big capacity and small size. The great Master-Control system does not work with a 2007 iMac: when the Controlled peripherals shut down, they send signals that reawaken the Master computer, defeating the whole point! If this is a problem for you, get one of the other Back-Ups. The 3 Controlled outlets are not spaced for 3 power bricks, and do not have battery backup.
My case runs cooler now that I swapped the Power Supply. I discovered the cable plugs are not idiot proof. I needed to swap out one of the modular cables, and I couldn't see where I was plugging unless i removed all the cables in front. I thought they keyed the plug. I was off by one pin. The clip went into the hole. I pulled on it, and it wasn't coming off so I assumed the clips were working to hold it on. Power up, and no spars, but some bad smell. Took some time, but after removing all of the cables i found a burnt out cable. The plug is now bad, but the PS still works.
Positives: Very Good documentation. Easy to configure. Good software. Well packaged, good guarantee. Good Price Needs improvement: master controlled outlets too close together. If a device choice is powered by a transformer one of the sockets will likely be unavailable
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