I think the ZVM is a better player obviously. As for the Cali, I agree that it's clunky and ugly but hey, it's all about the sound isn't it? Everyone in the gym has a much prettier and "cooler" portable than I do, but that's alright. I'm pretty content. I toss in a 2gb card and this little player served me all through my cruise workouts and all day lounging on deck without a hiccup. Best part is being able to simply pop in a new battery instead of facing a recharge. I know some will feel just the opposite about the battery deal but it does have its advantages.
I was thinking of selling this little dude some time ago, but upon reflection, I decided against it. It follows me as I work in the yard, in the gym, on the boat, and even on the jetskis!! Tough little nut.