Yes it is slow. I am going to have a few USB sticks which are 34gb and smaller than the 64gb I have now. For day to day use the smaller ones should be OK. The bigger stick good for long trips. Then it should let up have all of the music we have on the server at home. We have about 130Gb of music...lol.

If there is an alternative stereo that will work and keep all the car related functions I think we would swap it. The MMCS is not great. Its the worst thing about the whole car... lol