I'm skeptical of ported saws, but I understand the appeal. Free performance. I used to hotrod computers. You buy cheaper chips, and make them go faster. I'm not inclined to do it anymore. Lost interest in computers, and don't do anything that requires high performance anymore.
Same with saws. If I need more saw, I'll buy more saw. It gets more interesting in the air. You have weight constraints climbing, and every saved ounce counts. Been meaning to muffler mod my 2511, and I'd consider a port job, especially if I were doing more of this. Something like a ported 261 would be cool as an aerial "big" saw. Get more out of less weight.
edit:
Oh, and I'm not interested in loud saws, especially with the bigger saws(>50cc). When I only had a poulanpro, I didn't wear hearing protection. It was dumb, but wasn't painful. When I got my 362, my ears were ringing after 10 minutes. I had to stop and go buy hearing protection. I wouldn't want anything louder than stock if it can be helped at all.