I recently had a chance to test-drive two different MP3-CD players, the RioVolt and the Philips Expanium, and in the end, the RioVolt came out the clear winner.
When evaluating MP3-CD players, there are two things to keep in mind: first, that this technology is still in its relative infancy, and allowances will have to be made before the companies figure out exactly what works and what doesn't. Second, MP3-CD players aren't an industry-created standard; they are a response to something that consumers originally designed and made for themselves (MP3 encoding and the idea of storing loads of MP3s on a disc). Therefore, it makes sense that companies with relative inexperience in the market - Philips for instance - are going to lose out to Rio, who's been in the MP3 game for a couple of years.
The RioVolt is a nice-looking package, pleasantly round and silver with blue trim. It's got all the standard features - a window so you can see your disc spinning round and round, a hold switch, and the option to choose a 10 second skip buffer or a 45 second skip buffer.
There are several things that make the RioVolt stand out: it has a digital volume control, instead of an analog wheel, which is nice, and it has a backlit window, so you can see what you're doing in the dark (car trips, subways, etc.) In addition, it reads ID3 tags, which means you get to see the title of the song you're listening to - something the Philips player doesn't do. And, as a coup-de-grace, the Rio will read CDs made with Adaptec DirectCD - something other MP3-CD players will NOT do (and, unfortunately, often don't tell you they won't do on the box).
I tested the RioVolt for two weeks, and it preformed well the entire time (and hopefully, it will continute to do so!) The sound it produces is clear, even on MP3s ripped at lower than 128 KBPS quality, and it has no problem reading up to 320 KPBS songs (for all I know, it goes higher, but I don't have any higher-quality MP3s to test it with). I tried it with three different kinds of headphones, and on all of them the higher-end sound seemed to suffer a little, especially on songs where there were rapid treble spikes. Again, that could be an artifact of ripping, and not the player itself. The RioVolt is also upgradable, which other MP3-CD players are not (I would highly recommend getting the 1.13 upgrade from Rio's website). Unfortunately, you have to waste an entire CD-R to upgrade, but it's a small price to pay for a product that changes with the times. Additionally, even on 10-second anti-skip, dropping the player from 4 feet in the air (a little higher than my waist) didn't cause it to skip at all.
Of course, the RioVolt does have its flaws. The lid seems a little flimsy, and the stop button (located on the bottom of a "wheel" control panel, like some VCRs use) has to be pressed just right in order for it to work. If you change your ID3 tag, say in WinAmp (to remove "Various Artists" and replace it with the actual band name), the RioVolt still reads the "Various" tag, which is a bit of a pain. The biggest flaw, though, is the crummy headphones - you might as well leave them in the box and buy another pair. Mine only played correctly out of one side, and the other side died in less than an hour. The last item of note is the strange remote control, which I suppose could be useful, but adds another two feet of wires for you to tie in knots and catch on things. I found I didn't really need it anyway, as I just set the player to "shuffle" and let random effects take their course.
Will there be better players in the future? Undoubtedly. Is this the best player available right now? Hands-down yes. If you've gotta have the latest and greatest, or (like me) want a way to make your massive music collection portable without having to lug 100s of CDs around, go with the RioVolt. You won't be disappointed.