Since we're talking about pressurizing, here's a thread I wrote up on how I do it in my Brewhemoth.
Bottom line is, feel free to spund/force carb if you're not dry hopping. If you are dry hopping and need to filter enroute to the keg, then the carbonation creates some serious foaming in the line/keg, which may effect head retention.
I love mine, and as many have said above, the way I use it (under pressure) nothing else compares. Also the guys at brewhemoth are super easy to work with on customizations, and in my case it only extended build time by a week.