the Power FC is fully programmable guys. And its worth every penny. I am curious where you would be getting one so cheap though... is it from an authorized Apexi Power Excel Shop? IF not you wont have any warranty. You dont have full tuning capability with the commander but it does allow you to make a good amount of changes. Ideally you would want a Power Excel Shop to tune it for you with the PRO software, but since we are few and far between... you could consider the FC-Datalogit software.
Heres some info on the PFC for those that dont know...
http://www.zilvia.net/f/showthread.php?t=87280