I did a JAA Night and UK IMC with FIS Nov 2007 both accelerated (packing in as much flying as possible each day).
Brian M is an excellent CFI and Instrument instructor and went well of his way to accommodate my needs - I had a very competent German instructor for the Night training - Aki - very good english and a good instructor.
I chose FIS because I only had a short time available to do the ratings and didn't trust the November UK weather.
FIS was not the cheapest option. They were very busy and there were a/c availability issues due to a/c checks and utilization.
A/C were fit for the task but not the best turned out examples that I have flown - for me it was a gift doing the IMC training because I had to compensate for the odd malfunction - seeing them (di drift and refusal to slave, and an AI topple) for real but in good weather was useful. I understand that in both cases the instruments were about to be replaced.
I arrived prepared all bookwork complete and did the IMC exam first day before any flying - I did hear moans from one student about the ground school but he had arrived unprepared. I got useful briefings from Brian between flights on theory and application.
I found Hans (then manager/owner) easy to get on with but he may not appear to be the most approachable type.
I did a couple of solo VFR flights between my training flights - found my way out and back and I found the FIS local area briefings adequate.
Great scenery and clear weather when I was there.
I would use them again but I would as before arrive as prepared as practicable for whatever course I was going to do. It may not be the most suitable place for someone that needs a fully structured ground school. I intend to go back there to hire and explore as soon as I have the time.
I have since gone on to complete a Canadian IR and the training I had with FIS was an excellent foundation for me (thanks Brian).
Cheers