The device's satellite radio offers 130 channels, while its WiFi radio comes with over 70 channels. The WiFi radio's sound quality is definitely lower; however, you can spring for near-CD quality, 128kbps streams for an extra $3 per month.
The Stiletto conveniently ships with two batteries, one physically larger (and with more capacity) than the other. Rated battery life is weak for live Sirius radio, but it's decent for MP3 and recorded material playback.
Though it's far from perfect, the Stiletto 100 is a good effort and sets the bar high for future versions. The pricey device could be slimmer, ship with better headphones, have a better battery life, and include more memory--all details that might one day make the iPod an afterthought. But for now, the Stiletto 100 shines through its excellent interface that makes rocking out easy.