Seems like a lot of people on here like ESS.

If you go to Xbimmers everyone raves about Velos

AA offers a tune as well that seems to have a good following.

Then there's Berger tuning which has a huge following among the BMW community.

I wouldn't consider Dinan because IMO it's overpriced BS.

But the one requirement i have is that i can return the vehicle back to stock in the event that it needs to go to the dealer for a warranty issue...so obviously i'll need a handheld to do so. I know the Velos offers this as well as AA. i might be mistaken but the JB for the vehicle would simply be disconnecting the module under the hood...which is no big deal.

My truck is a 2010 X5M. Other than possibly a muffler at some point it's otherwise going to remain stock.

Thoughts?