I love the 546, I've bought two a few weeks ago here in Argentina... the bad part is that I bought a 1GB one and it costs 125 US dollars! (it was 355 Argentinian Pesos)
Now I'm thinking that maybe it could have been better if I ordered it from abroad...
A small review:
Advantages:
-3.5mm headphone jacks
- built-in speakers
-2 headphones output
- little joystick
Disadvantages:
As it says in his review, the delay between skipping songs or while surfing menus is a bit frustrating... it would be a perfect mp3 player if it had a better interface...
uhm my review matches the one Roberto did :P he's right in all the aspects