I compared the current modules and chose the JBD. This was based on the following.
1. Easy to remove and re-install (like a trip to the dealer).
2. Adjustable settings.
3. Cost is very low.
4. Has a 14 day return policy if you aren't happy (which makes trying it a no-brainer).
I installed it on my 335d and at 90% the increase is incredible. It transformed the car into a true beast. I was so impressed that I just bought a second module to install on my wife's X5d.
Hope this helps.