Yeah, just as I suspected, I was up at about 3AM to play with Iris for a couple of hours, then I slept for a couple of hours and have been at it again for hours. It is so easy to come up with unique and useable sounds with this synth. I'm really glad I grabbed it during the intro offer.
I'm coming at this with a fairly tech-savvy rock and metal guitar player's background, and I don't think it's just for sound designer's. I do a little bit of electronic experimentation and I've learned most of what I know about synth programming from playing around with Pentagon, z3ta+ and a few others. I watched that one video listed in this thread and I've checked the manual for one thing I couldn't find by looking at the screen and I've been off and running all morning.
Iris is unlike anything I've ever used, but at the same time, I find it quite intuitive and easy to program. At some point I'll probably try to check out the manual for more info, but I really think this is one of the easier synths to manipulate and experiment with. I don't really have the knowledge to go after a sound in my head and tweak the synth to get that sound, but I'm trying a lot of random stuff and getting a lot of very pleasant surprises. I like that you can get one or two samples to carry a melodic or harmonic type of sound and have another to just do random texture sounds in the background. I really like that kind of thing for pads and leads, etc.
Overall, this is one of my favorite new toys I've picked up in a while. Glad I stumbled across this thread... even if my wallet is a little lighter now.