Curious if something like this ever happened to anyone else here as it doesn't make sense to my non technical mind & I'm not imagining things. I have a 512 Black Zen Nano Plus which I love & just bought a Black 1 GB Zen Nano Plus. To begin with they're both listed as .8 ounces without a battery. I weighed them and noticed an immediate difference, albeit slight. I went to the Post Office used their official scale & both weighted the identical .8 pound (scale won't go to a second decimal place). My buddy who works at the Post Office also thought the 1 GB which is the exact same size, weighted more to & he also weighted it on his scale with the same .8 ounce results. I then set my 1GB player to the exact same settings including "rock" EQ as the 512 player & transferred as a test, 3 of the exact same songs on my computer that were in the 512 player to the 1GB player, to compare sound quality which I listened to on both players at the same volume level with the same headphones. Again, I noticed a slight difference in the sound quality- my 512 player had slightly better highs & lows. To quote the "Joe Shmoe Show"- "What is Going On?"- this makes no sense whatsoever. I tried calling the maufacturer and I got the usual Casey Stengle double talk. The result is, even though the differences are small & maybe not noticeable to most people, I notice them & am going to return it.