I had a Xtreamer MK1 for 3 years, a multi-media player that fully satisfy me since read everything. By cons, it was not the sound HD, which made me decide to buy the SW3. Attention my MK1 is not dead so far, my daughter benefits.
I read a lot about the forum, besides I left it aside because SW2 noted very bad. By cons, SW3, especially with the release of firmware version 4 was highly regarded by its users.
Positive: as MK1, SW3 reads all formats I use, makes the sound in HD :-) and is much faster than the MK1
Middle: the JukeBox. Besides I use the MOD and thumbgen => much better
Negative: it lacks the sort alphabetically in the JukeBox