Performance Chip for ZC and FMU

I have seen a lot of mod chips on ebay and wondering what's a good brand/type to get. Any of you guys have chip in your ZC DOHC motor and have good result w/ basic mods please let me know.
Also. how do you know if you have a 28pins or 24pins chip? What your gain and idle for a daily driven EF? Same w/ FMU, any recomendations?
Thanks in advance for your inputs. :D