Thanks for the great feedback everyone.
My ipad is not 3g but I use my Droid as a hotspot so my wife can use it on long trips. The plan was to just use a long dongle to connect it, so I didn't envision putting somewhere to be any akward then storing currently.
I think I'll skip, if I want to listen to pandora I understand the X5 should have an aux in anyway, and I'll just deal with not being able to control it through iDrive, not a deal killer.
Just didn't want to pass on a relatively cheap option and regret it later. Also don't want to throw away $300 for something I'll never use, so I think I'll skip it.