I've had this thing a few weeks now myself and am pretty happy with it so far for the money spent. I also have a WDTV Live and this new unit buries it as far as playing BD ISO's. So far I haven't been able to make it show the menu or top menu on mine but it supports chapters just fine and will play the file from the beginning rather then just grabbing the biggest file in the ISO so movies like Up start from the first rather then a few chapters in.
I haven't seen it do forced subs yet either but all that may be the way my ISO's are setup. It can also fast forward or rewind several ways very easily in almost any video file I've played so far.
To me the fan is kinda loud but not really bad once your playing something with the sound up a tiny bit.
I tried the Xstreamer firmware and it seems to work but was hard to navigate and see on my 34" 16x9 CRT set so I went back to stock for now, also the front display didn't work right if anyone really cares about that.
The Live has this thing covered as far as web type things, especially with B-rads FW but this thing is much better to me for everything else.
When I try to play AAC files I need to set the HDMI to LPCM so at least the TV can play back the sound or do the same for the digital out.
I think this thing is going to get better and better with time and the makers and third parties seem to be working on it, the official forum seems to be just fine with people modding and hacking the firmware too.