The stick units are kinda scarce. I looked last season before I upgraded my head unit. It's really a capacity thing for the sticks. 64 - 128 meg is not much space for MP3's. CD quality MP3's are 4 - 5 meg each. That's what, maybe 25 songs on the 128 stick, which isn't cheap like blank cd's. Rockford Fosgate makes one like this that hold multiple sticks to get more capacity, but it was not a cheap unit. I think it held 6 sticks, so basically had the capacity of one MP3 cd. I opted to just go with the mp3 cd. We mostly just listen to the cd's when anchored. It works up to about 1 foot chop without skipping while moving, but that's a rare condition where I boat. I carry 10 Mp3 cd's in the boat, for about 1500 songs. Imo, you're almost better off recording the songs to cassette if you want to listen while moving. It may be old technology, but it works!