Haven't posted in ages and this thread caught my (lurking) eye. Just to join in on the chorus, it works (JCW tach on my head, oh yes, yes yes, in my face, all of that, yes please) and I'm surprised how well it works.
Back when I had my ole 320i effdyn model (F30) from work, I also coded it but it was quite the faff. OBD2 to ethernet cable, fixing a windows VM, finding a usb ethernet adapter, getting the software, CAFD files and all that. It worked, it was just a big faff. This is brilliant. Money paid, no questions.
I'm hoping the bloke keeps it up to date, gonna get a LCI MCS and it'll have the new navi (like in the chubman) so the rumours go and I'll want my JCW tach on that as well.
I also fixed the seat heating temps (I don't have full leather, the nice half "faux" leather seats with the leather on the sides) to turn it down a few degrees as I find even on the lowest seating they cook my arse. Plus a few other bits and bobs while clicking around (DRL keeps the back lights on as well....seems safer).
Thanks OP for letting me know.