Slacker G2 Personal Radio Player (8GB, 40 stations)

Pros: Easy music discovery based on custom station and selecting favorite songs
Deeper music library than Pandora
The ability to store 100+ songs per channel
Small form factor makes it easy to transport and to use during work outs

Cons: 802.11g wireless range is poor
The user interface does take a little time to get use to.
Scroll wheel is not very firm which can led to scrolling while clicking
No Windows Vista x64 Driver Support
No Mac Drivers

Summary: Overall this is one of the best product ideas I have come across for internet radio and music discovery. The battery life is outstanding the form factor is better than the first generation and the price is reasonable seeing that you are getting the music for free. The wireless range is poor and there are no x64 drivers for this product.
However, these short fall or small in comparison to what you get with respect to music offerings.