I voted no. I would never port a defensive weapon, which is pretty much all a j frame could ever be. You may need to use your weapon at night and the muzzle flash from a ported gun will pretty much ruin your night vision for a little while.
As far as pro's and con's from what I can see.
- Reduces recoil.
- Looks cool.
- Could ruin your night vision in a fight and give the BG the upper hand. This is a HUGE downside for me and in my mind would rule out porting it.
Just my .02. Best of luck in what you decide.