I've used iRiver and Apple players before quite extensively (either owned or borrowed), and I just recently bought my first HDD-based DAP, a Rio Karma. I am dreading slightly what I've heard about reliability--especially since I didn't have enough money to get a warranty for it--but as far as I can tell most of these problems happened the first half or so of its lifetime.
Probably they got a bad batch of HDDs from Hitachi. Most of the reports you hear now-a-days are people who have RMAed their players back to Rio. When you get a replacement Karma from Rio you don't get a used one, you get a refurbished one--the ones that had a problem in the first place. So, yeah, most people who have bought new the last couple months seem to have been having few problems, no more than other DAPs. Or so I hope.
Besides, other players use these Hitachis, and I've not read about unusual failure rates on them. For instance, the GMiniXS200, as I understand it, uses the same drive as the Karma. Also, Apple uses a different Hitachi drive in the iPod Mini. So, yeah, probably just a bad batch.
Though I must admit I
am making an effort to treat it gently, just in case.
BTW, it's definately the most awesome player I've used so far. Very intuitive interface, I'd say better in some ways than the iPod, and in some ways worse. For instance, when choosing music you can first choose the letter first, then scroll through all the options under that letter. Much faster than having to scroll through every entry of every letter like in the iPod. Then again, there are a few more eccentricities than the iPod, but coming from an iRiver, it took me about 5 minutes to figure out how to do
everything on this thing. VERY easy to use.
The sound quality seems excellent, the RCA outs is a nice feature, I must admit. The dock is very cute.
My hand is slightly larger than I think they designed it for, but it still works great, very comfortable to hold, even in your left hand. This is nice, since not all players are that comfortable for me to use. The iPod Mini just doesn't work that well for me, for instance--the click wheel is too close to the edges of the player, so my thumb cannot comfortably circle the bottom-right part of the wheel. The normal iPod works fine.
Oh, and once you get used to gapless it's hard to use stuff that doesn't have it. Good stuff.
Wow, I'm rambling. I'll shut up now...