This is the best sounding (to me) SEM emulation to date. Oberhausen WAS the best (to me), and still sounds good and is a steal if you get it for $20 or less. Side-by-side you can hear the difference, though. And, OB-E uses half the CPU on my system with 1 module on OB-E vs Oberhausen in mono mode.
The UX is certainly more complex, and the price is premium. However, even Mr Tom Oberheim says it sounds close to the hardware (which I've never used) to the point where he and a former Oberheim engineer gave some pointers and got Tom's name on there.
It's at the top of my "if/when I eventually buy another synth plugin" list (I've been stripping out plugins right and left to a more reasonable number). The price makes it less of a casual purchase, however.
I also should say it's very different sounding than my OB-6 (which I still prefer). The software output is darker as well as less lively. I'm sure many will prefer the first and not care about the second thing. I just didn't want something that strongly overlapped with my OB-6, so the OB-E stays on my To Get list.
The worst thing about the demo, and the reason I stopped using it, is because there's no way to create an init patch without manually resetting every single control every single time. Just plain old bad UX that seems more driven by Marketing than Design. Which I'm sensitive to.