My bad, by "proven technology" I meant that the VetScan 2 has been out in vet clinics for a year or two, while Catalyst is a new product that could have problems after the launch (equipment failures, maybe a specific part breaks down consistently and needs to be replaced, etc.) The jump from plasma to whole blood is pretty big, so while the VetTest has been very dependable there are no guarantees with Catalyst. That's kind of why I was curious about the delayed launch (i.e. maybe beta testing isn't going well, etc.)
Nothing to do with dry slide vs. wet slide...I can't really speak to which one is better. Probably depends on who you ask!
I should have clarified the proven technology comment...I think Catalyst looks like a great machine. If it works as advertised, and the launch goes off without a hitch, I think it's a home run.