I picked up the new blower on Friday so I had to wait til today to really use. I did blow out my trailer and my truck over the weekend, but today was the first real use. 1. Comfort- extremely comfortable....lots of padding on the straps and the back. I have the 8510 and the 630 and the new one is far more comfortable then the previous 2. 2. Weight - it's a pound or 2 more than the 630 and a 2 less than the 8510 so it works for me. 3. Power - WOW....way stronger than the 630 and feels about the same as the 8510....I checked the site for specs and the volume at the nozzle is the same and it feels that way. 4. Design- Is along the same lines as the others but seems a little thinner but taller. This is of course meaningless. The tubing is nice....though a little long (and I am 6 ft) it was actually making my forearm sore holding it firmly. It is the same length as the 630, but thicker. It has a nozzle piece you can use if you take of the longer last section and replace it with said piece. With this on, it is the same length as the 8510. So there you have it.....after one day. No idea about reliability (obviously) but I have had good luck with Shindaiwa.