The older two cycle lawn boys are awesome mowers! I personally love them. Nothing wrong with starting with them and as the guy above mentioned the coils are a pretty common failure and they're kind of hard to find but you can find a few on ebay.
I personally have two of the Toro suzuki two cycle 21's and love them. They're pretty fuel efficient and cut great imo. You won't be able to bang out a ton of lawns using 21's unless the lawns in your area are small but they will get the job done.