I've used an MTD, Sears "Pro", and now a Kawasaki. I would list it as 1.Kawasaki 2.Sears Craftsman "Pro" 3.MTD
The MTD was just crappy, but the 10 year old Crafstman "Pro" was actually pretty good, I just had issues with it flooding a lot. The Kawasaki is great, though. It seems to get too hot around the muffler, like they should have put some of that silver insulation there, because it is very easy to touch your arm to it while trimming. Otherwise it is great, great on gas (I had maybe an 1/8th of a cup? in it and I was surprised how long I was able to trim), starts easily, lightweight, and powerful. It is VERY loud, but there is no reason to not wear earplugs, so I don't see any major issues with noise.