Sorry to hear about everyone's negative experiences with AmpCity.. I am still loving my Merlin and it really is unfortunate that people in the UK are starting to avoid UM products for their customer service issues.
I would like to point out that my experience with Stephen from custom-iem has been nothing short of spectacular. Replies always came within 24 hours and even 6 months after I received my Merlin, Stephen has maintained the same excellent customer service whenever I contacted him.
Hopefully UM can repair their image.