The implementation of three sound-types of random patch generation is very cool. Very clever. Expect to see more developers adopting this route.
As for the sound...It's very different from most of the VSTis' out there. The sound is cozy and warm instead of knife-like sharp. When being used in a mix, it blends in. I think this characteristic empowers daAlfa2k a different yet very wide range of fitness for many kind of music genre.
Stability: Very stable within all my hosts.
V2.0 upgrade: A big leap forward with the ability to use custom wav, and also bundled with a selection of wav files to start with. This is a tasty new feature that vastly enriches the sound pallette of the synth.
Edited due to recent debate regarding the review policy and the new manual. As a beta-tester, at first I wasn't really impressed by the sound, but it grows on me as I dig in and put daAlfa2k into actual use. I've put quite some commercially purchased plugs aside, whilst daAlfa2k has become one of the few most favorate plugins of mine in the mean time.