I've got a PJB100 right now, and I have to say that even though it's slightly larger than an iPod, the 40 gigs of MP3 storage more than make up for it. It's like the difference between having the empeg in my car and having a 64mb flash player.
I've been following the Riot, and I definitely think I'd get one if my PJB were to stop working. The PJB has a lot of the things I like about the empeg, meaning database driven organization instead of file based, and a nice, clean, well thought out UI. The Riot just seems to take this to the next level with a lot of the cool playlist features that the HSX-109 has.
Rob, from other posts you seem to have seen a lot of the Riot, and may have some insight into it that we'll never have. Here's a question for you: Given all three of these products (Riot, HSX-109, empeg), which one's the best from a music management/organization perspective? How about the perspective of sheer usability? What does the Riot do that you wish the HSX-109/Rio Receiver/empeg would do?
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-Aaron