I picked up a 20334 on Friday and mowed twice this weekend. This is my first self-propelled, so there is a bit of a learning curve for me. Overall I liked it very much. It did a nice job and definately has more power than my 14 year-old 5.5HP Toro.
The only thing that bothered me was that with no throttle, you start it up and go right to WOT on a brand new engine - yikes!
I also noticed that the B/S manual that came with it suggests ALWAYS using fuel stabilizer. Ironically, I read this just a few hours after hearing from a small engine mechanic that bad gas is to blame for MANY small engine ills. He also stated that gas can and does go bad very quickly some times.