I used a 1000W MSW inverter for years on several TVs, DVR, computer, and on my VIP211k sat receiver. It worked fine!
Just bought a Samsung 32" TV. When I plugged it into my MSW there was a pretty loud buzz coming from inside the TV. It worked OK but I thought that the buzz was a sign of problems down the road.
Better safe than sorry so I bought a 300W Go Power PSW inverter and it works fine, no more buzz!
The buzz may be from an inductor in the switching power supply saturating because of the low peak voltage of the MSW inverter. Just guessing on that.