Hello Seahound,
I bought the Kronos (supreme) a year ago and have really enjoyed it -it's been reliable and easy to breath. If it's tuned right, the Venturi switch is probably the most useful feature because you can breath easy at depth and not have free flows at the surface (if you remember to use it).
As for the side exhaust, it's a tad gimmicky but I still like it. It puts the bubbles 'out of the way' so that they don't bother me when I'm diving upright for taking photos or such. When I'm horizontal though I don't really notice the difference. I also read that it's supposed to warm the incoming air but if it does, it's imperceptible.
There is a problem with the side exhaust collecting water after a dive, so it does require a little extra work when you're cleaning gear.
Compared to other Aqualung regulators, it seems to me like it's the same car but with a few extra bells and whistles.
Cheers,
Doug