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Not sure if your local BMW dealer is also a Dinan dealership or not. If they are a Dinan dealership, I'd buy the sport unit through them and have them install it. Granted there is no matching warranty, but if you have an issue (CEL) or something "wonky" going on (unlikely), you have the dealer support to troubleshoot the issue / Dinan support through the dealership too.
Certainly, if you are on a budget and want to get by as inexpensively as possible, buy the JB4 and install it yourself. If on the other hand you want some dealership support and likely better communication with Dinan direct, then I'd go with a dealer installed Dinan sport. Hopefully you won't need it. Also if you go the dealer route, you won't feel the need to remove it every time you take the car in for service.
Considering we are talking about a $50K automobile investment, a couple hundred$ one way or the other isn't a deal breaker IMO.
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