Several folks here use Propane injection and I am in the process of installing it. Probably the most knowledgable person here on the subject is Quadzilla.
He runs a Powershot 2000, same system I am putting in. Its a vapor phase system and has some advantages, including saftey, over the Bullydog which is a liquid phase system. Either works well if set up properly but if not properly set up they each can ruin your engine.