You know, Marc at Gemini has a very good reputation and the work he does, including hybra-porting, is excellent.
Folks' opinions vary on porting as do their experiences, good or bad, with different porting methods and different gunsmiths.
Marc from Gemini Customs was featured in American Handgunner, July/August 2009 edition, and they did an excellent write up on a ported J frame. Lots of pics too! Just scroll to page 42.
http://fmgpublications.ipaperus.com/FMGPublications/AmericanHandgunner/AHJA09/
I don't own a ported firearm, but if I ever had it done, it would be through Gemini, since they are strictly professional. Maybe you should call them up and talk to Marc about what you are looking for in a firearm and how he might be able to help you.