I'm very happy with Audio Horizons. I use the tube pre-amp and the tube DAC. Generally, as you see from the chat threads, users love the products. There are exceptions to the rule, such as Tvad, but they are the exception.
Since there is a home audition program, I think you should take advantage of it. In more than 1000 posts, and across several threads, comments about the home audition have expressed satisfaction, even those who may have chosen a different pre-amp ultimately.
One thing about this thread that I do regret is that someone who reads the title but not the thread may get the mistaken impression that you are saying that you are unhappy with Audio Horizons, and why. Maybe you can correct that situation?