I have about a week of usage of Kenwood HD60GD9EC which I got it through my acquintance (actually person who woks in our subsdiary) in Japan. In Japan, the unit is being sold at around $540 and I paid about $25 for shipping and handling which came out to be $565 total. I thought this was a good price as compared to about $680 which Bluetin.com currently charges.
Regarding the hiss I didn't find it anything unusal with this unit. Depending on the songs I play I do hear some hiss but I would hear the same hiss on other players (Zen & iRiver) as well. Perhaps, I have a dumb ear but I didn't find a hiss to be a problem with this unit. Kenwood said HD60GD9EC has a vast improvement over previous devices (30GB, 20GB & 10GB versions) so maybe they corrected the problem. Who knows?? Some said Supreme EX fixes the problem but I didn't really pay attention as it didn't stick out be a annoying factor so far (after listening to hundreds of tracks in all different genres).
If I have a gripe over this device, it wouldn't be a hiss but a user interface and/or usability. You are confined to a rather primitive, proprietary software called "Kenwood Media Application". By no means it is a buggy software but it is slow and let you do just the basic stuffs (transfer files, synchronize, create playlist, edit tag info individually - no mass tagging). Although you see the device as a hard drive under my computer, you cannot drag and drop the files. If you do it under windows explorer, you won't see the files in the player.
It is exremely hard to get the accessasories even in Japan. I ordered a leather case from Xigma.com in Japan and they just sent me an email telling me it will take about 3 weeks to ship it to me. Although this player has the english menu option and software supports english Windows but you will have tough time finding updating the firmware at Kenwood website (all in Japanese). I am not too exicited about the menu system in this player either (maybe I am not use to it but rather confusing and cumbersome to me). This has decent screen size but doesn't even play the video, so what's the point?
Just like any other said in this forum this player only does what it does best, which is to player audio tracks. This is little more than a just regular MP3 player when it comes to SQ (using SE530). It produces remarkable clarity, deep-down bass response with dynamic soundstage in such an elegant fasion but even then I honestly didn't find the overwhelming "wow" effect comparing to other MP3 players using the earphones. I guess there is a certain limit of satisfaction using the IEMs.
I thought I amlost got blown away after connecting the HD60GD9EC to Bose speakers in my car (thru just a regular cassette adapter). I reconfrmed it wasn't just a regular MP3 player. It has only been just a week with this player so I am still in learning phase...if you ask me if it's worth over $.5K,
I would say I am not sure...if you see my device in FS, you would know how I think about this device.