I've been waiting to review Infinity for some time- with the 2.05 patch, it's out of quarantine. The program has been around for while but this is only the second review-a cynic would suggest that the program simply hasn't been cracked, but it could simply be the fact that Infinity requires a lot of time and effort.
Infinity is very ambitious. It is not for the faint of heart, and at this point there are still few available pre-made patches/synths available for it in comparison with Reaktor. I like the interface, it is big and the routing scheme is groovy-looking. Now that Infinity is also a VSTi and DXi host, it is more difficult to generalize about the sound-it varies with the patch. Heavier and darker sounds come with ease- recommended if you want to make industrial metallic sounds that haven't been heard before.
There are still some stability issues ON MY SYSTEM but it is a stable program all in all, no problem using it, just some crashes when working on patches. Same thing happens in Reaktor sometimes, for me.
As a VSTi/DXi host it is very good. Since the program is so deep, I'll give ver. 2.05 more time and review again later. In the meantime, if you're serious about modular software synthesis, this is one of the heavy-duty programs you must demo.