I have owned the AHB2 stereo and monos. I love the crystal-clear sound of the AHB2. It is actually my favorite sounding amp. However, I sold them to get am amp with much more power, CODA #16. Overall, I like the CODA #16 better.
Here is a great description of how the AHB2 sounds. Totally agree with this post.
(2) Review and Measurements of Benchmark AHB2 Amp | Page 5 | Audio Science Review (ASR) Forum
Currently, I also own a modded Peachtree GAN1 "amp". The mods took it to spectacular levels. However, it is a PIA to use. So, I am going to use the GAN1 for headphones and get another amp for the Yamaha NS5000 speakers. The GAN1 is currently driving the NS5000 and it sounds very good. Just a PIA to use.
If you do not have a very hard to drive speaker, then you may like the AHB2. I am thinking about it for the NS5000.