I just looked on the Sirius site, and I think that I have the Stiletto 100. I bought mine refurbished (cause I'm cheap). The disadvantage of it, as far as I know, is that you HAVE to use the antenna/headphones with it while you are wearing it because there isn't another antenna for it (if you are using it as a portable). Again, you can wear the antenna headphones around your neck and also use some earbuds (which some folks find more comfortable).
Now, if you're not wearing it as a portable, you can use the docking station for the vehiclees or you can get the docking station with built-in speakers and external antenna. I bought one of those for use in the barn and ended up buying another antenna for the house. So now, I have one antenna mounted at the barn (with the plug in hanging where I set the Executive speaker set-up) and one antenna mounted at the house so I can just move the speakers to whichever location I am at. I think it has pretty good sound, but I'm really not that much of an audiophile.
I liked the Stiletto better than the other offerings mostly because you can wear it as a portable, use it in a docking station for a vehicle, or put in in a docking station with a remote antenna for in-home use. That pretty well keeps me covered.
Let me know if you have any other questions. Good luck and take care.