I sort of did the USB flash drive/memory stick thing as an experiment. I wanted to see how well it works, how easy it to operate on our simple base level radio systems, & if the quality of sound was there. My conclusion was that it works well. I wouldn't say "it's the greatest thing since sliced bread"! By the way - I've been to town in Missouri that take claim to inventing sliced bread, but we never get off topic here!
My best upgrade is that I will go weeks sometimes & never even turn on the radio. I've come to love "peace & quiet" more. I tend to listen to stuff on longer trips sometimes, when it helps time go by faster.