How well built are the Briggs Vanguard v-twins in comparison to the Kohler, Kawasaki's and Honda v-twins? I've been around all of them but the Vanguards and I'm considering buying a used mower with a Vanguard 20hp on it. I know they are Japanese made (Daihatsu or Mitsubishi it seems?) but I just want to know how they compare in reliability, smoothness, power, build quality, etc. For those of you who've seen these engines castrophically fail, how many hours were on them and how did they fail? (thrown rod, dropped valve, blown head gaskey, what?) Or, better yet, did these engines have a particular weakness that caused failure on a large # of them that is common knowledge? Thanks for any input.