Pros-Compact first stage,simple user adjustments,side venting exhaust tee,and ACD dam on the first stage inlet.
Cons- Base version is not dry sealed,but higher priced Kronos supreme is.
Work of breathing scores fell into the excellent category for rec diving, and the very good category for the more extreme tests.
The first stage comes with 4 lp ports and 2 hp ports. Reviewers gave the side exhaust on the second stage a unanimous thumbs up.
The Scubapro Mk11/S555 was the 2007 Testers choice and was $80 bucks cheaper,just my 0.2$