I put a 8 pin on my 441 with a 20 and I'm still on the fence about it...
I think it does cut faster and has a little more tendency to bog. It doesn't bog/hang real easy, but you can't lean on it like you can with the 7.
Like what was said above, it's a blast to cut cookies with, but a little "uncomfortable" in a real world cutting situations. Mainly because I'm not used to a saw cutting that fast and it can get away from you as you tire. I think it would be fine once I got used to it, but it makes the saw a little more temperamental in the cut and thus a little more tedious and tiering to use. At this point I'm thinking of switching back to the 7 for "real world cutting". If I was just cutting in a pile of cut to length logs into firewood all day, I'd probably stay with the 8....
But for the price, you should buy both the 7 and 8 to see the difference for yourself.
Excellent question by the way.