Hello Joe!
Welcome to the forum. My experience with dedicated astro cameras is limited to SBIG and Atik. I have owned three Atik cameras...the Infinity, Horizon 1 mono and Horizon 1 color. Save for one adjustment that was needed for the Horizon mono and covered by the warranty, the Horizons have performed as advertised night after night. Build quality and consistency have been great.You are correct that Atik service work is handled, to my knowledge, exclusively in the UK but my experience with the warranty work that I mentioned was among the best customer service I've ever had. When my adjustment was completed, it left the UK on a Wednesday afternoon and I had it in my hands in northern Michigan, without any return shipping cost, on the following Friday morning!!! Pretty darn amazing.
As they say...your mileage may vary but I hope this helps a bit with your decision. Let us know what you decide to do!
Cheers!
Craig