Well, after a couple days with them. here are my thoughts.
I purchased the Rio's through a groupon deal for $40, and for that price, I really couldn't ask for more, and as a whole, I think they're a pretty solid pair of in ears. The Rio are definitely bass heavy, but not so much so that the bass is overpowering, also the lows rather clean and well controlled considering how relatively prominent they are. Noontec really did a good job keeping the bass from muddying up the overall sound of the Rio. As far as mids go, they're a bit recessed for my tastes, and on some songs vocals were a little hard to hear over the low and high ranges, although this was fairly rare. The highs in the rio are very clear, and crisp, and at times maybe a little bit harsh, but I've always been sensitive to highs, so that harshness could be unique to me. Overall though, so far I really do like the Rio's, and I'm extremely glad that I was able to get them for such a great price. The only complaints I have are the lack of accessories for the price (they only come with a little case, and 3 sets of tips) and harshness that arrives on some songs, but other than that, they've been very enjoyable to listen to. I would definitely recommend them to anyone who is looking for in ear headphones with good bass without muddying up the mids & highs, or someone who wants ANY of the beats in ears, as these look just as good, and sound leagues better, and thirdly to anyone who wants a stylish, good sounding, and very comfortable set of in ears to wear around. If you want to know if I feel that they'd be worth $100, I would have to say that depends. If you're looking for the best sound for the price, then I would say you can do better for the money. If you want in ears that sound pretty good, and lok great, while being comfortable, though, then I would say that their full price could be easily justified.
Sorry if that might be a bit hard to follow, and if you have any questions let me know. Also I can do comparisons with plenty of other IEM's in a similar price range to the rio's if needed ie Nuforce NE-700 Klipsch s4, and many others.