Yeah, I do. I sent in my stock seat to meancitycycles and they retrofitted it with a combo of gel and new foam. Seems firmer and more form fitting to your butt. So far, I like it.
One of the guys I ride with went to a lot of trouble removing his cover and carving out foam and installing a jell pack, he says it's better but still not super comfortable and is now looking around for an aftermarket seat.
I had a gel pad fitted in my 07 sporty stock seat for $150.00. Very happy with it. Kept the stock look and is definately more comfy. Will be putting RK shocks on this week to add more comfort.