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Here's a very in-depth and honest look at CyberPower Systems' GX1325U sine wave uninterruptible power supply. It's the model to buy if you need such a thing, but there isn't much competition.
The good:
1. Yes, it really has a true sine wave output. And that output stays clean even under heavy, highly inductive loads. I didn't expect it to do nearly as well as it did!
2. It passed my brutal "furnace fan" test and kept a Power Macintosh G5's very picky power supply happy.
3. It has a serial port, though presumably only for simple signaling.
4. You can use it to provide a power backup for almost anything that plugs into an outlet, so long as you don't exceed the ratings.
5. Pricing is very competitive with other UPSes having only a "stepped" sine wave output.
6. It's basically the only UPS having a true sine wave output at this price point.
7. The alarm beeper can be silenced, and the status display made to illuminate constantly.
8. Three year warranty.
The bad:
1. Automatic voltage regulation only boosts low line voltage. High line voltage conditions require this UPS switch to its battery.
2. Line voltage reaches approximately 140 volts AC before the UPS intervenes and switches over to battery. Most anything should stand this for a little while, but it's stressful and I could see some devices not taking it so well.
3. Batteries appear to be custom-made for CyberPower, thus locking you in to their replacements (at least for now). Given some time, I am sure the aftermarket will come through and you could always modify the unit to run with external batteries.
4. An equipment protection policy having some ridiculous claimed value is provided should a failure of this product damage your equipment. Just read the fine print, expect technicalities galore if you ever should file a claim and be prepared to provide superlative proof that everything was in order.
5. CyberPower doesn't discuss the serial port or what you can use it for in their documentation. (Maybe it's on their web site.)
6. Adjustments of the unit's operational characteristics don't seem to be possible through its front panel interface, beyond the most basic settings (display constantly on and beeper muted).