I love that my Echo pro saws start easily every time, run great and are as reliable as a Toyota, have enough weight to be very durable and not have parts loosen/fall off, nor cases crack, and in the case of the Echo 620p and 7310p, are within 1- 1.5 lbs of their more expensive competitors.
Life is good.
I'm at a point where I know every nut and bolt of every 60-116 cc Echo saw. I know how they run, I know what fails, I know what needs changed.
The 620p though durable,they do have a few things that rattle loose, once you start really cranking up the rpm's:
1. The chain brake toggle has to be lubricated in the cold. If it freezes in place, it breaks the plastic tab on the brake handle. Echo redesigned the brake handle with extra reinforcement in this area. They sent me one free of charge
2. The thin sheet metal deflector eventually cracks. Had to replace mine with a gear head deflector. Also used loctite on the screws, as I think this is where the issue starts: deflector screws loosening up.
3. Once the carb is modified with the walbro 86-578-1 fuel nozzle and you start hitting 14k rpms on such a long-stroke saw, the clutch will spin loose free-reving to tune the saw. Loctite fixes it.
I've cut continuously for 3 years, with my 620pw with 20", 24" and 28" bars. I've settled on a 24" versacut bars on both my 590 and my 620. These are the saws I use most and I have no qualms with the weight.
The cut speed and torque of these modified 620 and 590's, I actually quit 50 cc and 40 cc saws. Gave them all away as gifts to friends n family.
From gnarly birch burls to saw logs, 620pw has no problem pulling a 28" and full house chain. Bar oiler kept up just fine.