I had a choice between an '04 sportster 4 tech (155 HP) 58 Hours or an '05 Sportster 4 tech with the supercharger (215 HP) hours unknown. Both were priced at $6300 and both looked very clean. The '04 was from a seadoo dealer and came with a 30 day warranty. He also did a full tuneup and oil change on the boat The '05 was a private sale with no guarantees at all, except the word of the seller who swore it was perfect. I did some homework and found that the supercharged (215HP) has its share of problems with the ceramic washers. I had no way of knowing if the '05 had them already break in the engine and maybe thats why he was selling the boat or if they might go after I buy the boat. I also didn't like the fact it must use high test gas where the 155 HP uses regular. Anyway, after talking to two different boat mechanics they both said the supercharged seadoos are in the shop all the time and to go with the much more reliable 155HP '04, and thats what I did. So far its running perfect and am happy with my choice.