First of all the design and usability are perfect. Great and easy to use and you've got some nice addons like the Delay for example.
The issue for me is the sound. The simulations are realistic enough but sound not well defined and a bit blurry. The attack is bad, the sound is a bit hollow and the EQ does not help too much. Still prefer my LePou sims. Hopefully UA will solve some of these issues in the future because quality does not justify the price.