I"ve just had a new head unit fitted to my First gen MCS
(Kenwood btc61u) and cant believe the difference its made .
Thanks are due to the chaps at car audio centre in cotteridge birmingham. They were extremely helpful and having discussed my requirements talked me through the options . Suggested upgrade path was head unit, sub woofer and finally speakers . Having just had only the kenwood head unit fitted I can't believe the difference in sound quality-I'm surprised how good the standard speakers are and how much improvement can be gained from a relatively smalll outlay .
If you are looking to improve sound and get all the benefits of iphone compatability then the Kenwood unit is well worth a look.
If you are in the Midlands area I'd suggest giving Car Audio Centre a call , they give good advice and a very efficient service, its a bonus that they know their MINIs one of the chaps has a nice dark silver MCS
with some interesting wheels and exhaust