Hi there,
I also live in the UK (London).
I have had a thunder-max fitted to my 2007 cvo road king for 2-21\2 years now, on the whole it works very well,
with the autotune function, did have a problem with the unit after about six months, but zippers replaced the unit
without question, and its been great ever since.There are constant updates with regard Maps, software and firmware.
You just find the map that closest matches your engine config (cams/throttle body/exhaust etc), upload it to
the unit and after a few setup procedures, away you go, the autotune will tune constantly, the more you ride
the better it gets.
The most important thing to remember is that if you decide to change the config of you engine, it will always
be able to be updated with a new map.
You will never have to update your choice of ECU again. (bought mine from mandmcycles.com, talk to Mark,
he does a very good deal).