Most InWin cases use these same powersupplies under the brand name of "Powerman". They're all made by the FSP Group if you compare model numbers. I use the 300W version on a pretty heavily loaded Athlon 1900 system (Epox 8kha+,512,2 HDs, 2 CDs, GF4 Ti4400, NIC, SB Live, etc.) and have used this same PSU for 3-4 years now. Tomshardware did a nice power supply review a while back and the FSP ones came out very high for their rather low cost.
We buy the Sparkle 300W ones from newegg at work and use them to replace blow PSUs (mostly old Deer <shudder> ones from a bad batch of OEM machines) and haven't had any problems with them though most of those machines are older P3s.
If you can get this PSU for $15 it's a great deal. Newegg has it for $27 or so from what I recall.
Gaidin