from experience, it's a very smooth machine. Klas, I don't think he wanted to start another "what's the best walkbehind?" thread.
Dixon, I've bought more than a few of those myself, and had the same problem on a couple. The "snapback" on realease would kinda hang up. Watch it closely-sometimes a good WD40 spray around the spring area and even a little grease around that plate where the drive rods connect? Obviously you've greased the 2 side fittings, I assume.