I've had a 310 for the past 9 years or so. The year after I bought it, dad picked up a 360 pro. The 360 is a definitely a nicer saw, more torque, smother, and a bit faster though the log when compared to my 310. I've used both for long periods of time and I don't really notice the weight difference, but I'm 6'6" 290 lbs so take that for what it's worth. Personally I'm ready to put the 310 aside for something in the 440 - 460 range or larger. The 310 is still running good after cutting ~12 full cords per year year in and year out.
I can't justify the cost of a new 441 or 460, so it will have to be something used. In my situation I will not upgrade to the 361 (or 362) even if it cures cancer. There is not enough of a step up from my 310 to justify the additional $$ now that I have made my investment. I don't know what the cost difference is now, but when I bought it was ~$150 (from what I remember) to go from the 310 to the 360 pro. In retrospect that may have been money well spent, but I suspect I still would want a bigger saw now. In either case you won't be disappointed, but if you have the $$ I would go for the 361.
For myself, if anyone has an 044, 046, 066, 440, 460, 660, or even an 090 they want to part with cheap let me know
. Woodcutting season will soon be here again and I'd love to have a little more power.