I have ATI 2007. I bought it in June 2003; one of the very first ones made. However I'm still gathering the components of my system and therefore mine is still in the box. I researched a great deal before making my decision. HT magazine (march 2003) rated it the best amplifier under $3000.00. If you visit audioreview.com, you will find a review on ATI 2007, however for some reason it was submitted under ATI 2505. The writer was clearly writing about ATI 2007 - (it is the last review in that category up to now). The review is excellent. He loves his ATI 2007, and he is using it to drive Martin Logans.
As for customer service my bet is that it is very good. You could call anytime and talk to Mike Pontelle the co-owner of the company. Mike is a very nice guy and will gladly talk to you about any subject. They also offer 7 year parts and labor warranty. I can't wait to start listening to mine. Every review so far states that it is a very powerful amp with good base control and very accurate.
Good luck
As for customer service my bet is that it is very good. You could call anytime and talk to Mike Pontelle the co-owner of the company. Mike is a very nice guy and will gladly talk to you about any subject. They also offer 7 year parts and labor warranty. I can't wait to start listening to mine. Every review so far states that it is a very powerful amp with good base control and very accurate.
Good luck