I just received my SD-6915 from J&R. I had it delivered here at work. I hadn't found any reviews before I ordered it, but all the reviews I have found in the meantime have been either neutral or negative.
Unfortunately I was too ignorant to realize that on a cheap universal player like this you apparently HAVE to hook up a TV to get access the menus that allow you to configure and control the player. The front panel display of the player is extemely minimal. I bought the player to use at work, for redbook CD, SACD, and MP3 CD playback. It seems like it may not work out here at work since I have no TV or monitor to hook it up to.
Currently I have dropped CDs, SACDs, and MP3 CDs, into the player and they all play. Unfortunately, I can't tell which SACD layer is playing or whether the CD playback is being upsampled or not. I've only been listening to it for about an hour, so far. I have it hooked up to my Tangent Meta42 and my HD-600s. There does not appear to be a headphone out on the unit itself, so I am using the stereo line outs. The front display does flash SACD when loading an SACD disc so I presume it is defaulting to the SACD layer, not the CD layer.
I found the toshiba support website that had the notice about the upgrade CD. According to the site my player has a serial number post the deficient players. Much of the bad reviews I read about related to ergonomics and DVD playback so they may not matter much to me.
Anyway, so far it sounds MUCH better than the IRiver SlimX-350 it is replacing. I consider the SlimX a decent portable, but the Toshiba beats it handily, at a price that is little more than I payed for the SlimX a couple of years ago when it first came out.
-Z