A few years ago, I bought an Acer Aspire M1100 box for my mom's home office. She used it for heavy MS Office/outlook, accounting software, and web browsing with occasional video/audio streaming. Sadly, it died a couple of weeks ago. I tracked the issue down to a mobo or CPU problem. This was an attempt to rebuild the computer in an economical way, re-using as many components as I could.
I decided to replace the PSU, despite the fact that it was still functional (POSTed with a different mobo/CPU/ram combo). I got a good deal on a PSU that is more efficient, powerful, and less likely to fry my new components in the next year.
The only major hurdle was the case. Because it's Acer-built for an Acer mobo, it had a weird combination front-panel connector and was missing a chassis speaker. It took several days to track down the needed micro-connectors and speaker (yay Microcenter). I also had to grind down a piece of plastic off the front panel to fit a front intake fan. Also, cable management cutouts were nonexistent, so I had to make do.
Overall pleased with it. Runs snappy and very quiet.
Note: the pics show CX430M PSU, which I later replaced with the non-modular version for the money savings.