i got the hpb kit for my car and my cousins. The map lights dont stay on in my cousins 2009 335 while the car is running.. they will stay on for a few seconds and then shut off. From what i remember the problem is only when the car is on. The dome is hit or miss, but for the most part it works. All other lights work fine. i ended up having to order some bmw leds for his maps, those stay on but they arent anywhere near as bright..
i have the hpb kit for my e90 too, just havent installed them yet. the hpb kit is probably as good as it gets but they dont work right for everyone.