I use the PCM-D50 since June 2008, I have not had the courage to wait until October to get it in France, especially since I needed a quality camera to record the rehearsals.
All I had seen before, except for the DAT, seemed very robust and disappointing (I tried the Zoom H4, the Roland R09, MicroTrack), or I travel a lot, often with a backpack, and I need a solid camera and a sound that is the best possibe to record acoustic music in my travels.

This unit goes beyond my expectations, it is just cleverly designed and a value price!

A little anecdote: we needed to record a song as a duet for voice and guitar album "Logodennig" in honor of Kristen Nogues, published beginning September 08. In the short time available, it has released the PCM-D50 brand new to the duo. The guitar is amplified with an AER compact60. a little reverb on it in the studio, and that's a title that sounds incredibly good!

for the curious is track 8, Ar Men Du, samples Listen here ( http://www.believe.fr/albums/24656%2Clogodennig-1952-2007.html )
we would not have done much better with a couple of Schoeps!

the radius as, among other things, that I prefer:
Big-knob adjustment of input level during recording, so indispensable and absent in the competition.
- Ease of use (my grandmother could use it without asking any questions)
- Robustness
- The button "divide"
- Security file deletion

some flaws?
- The lack of "Jack or XLR inputs 6.35, but the input-output minijack are excellent
- The inability to record mp3, suddenly it takes place quickly, and that force to make more frequent backups

I ever did without hesitation that choice tomorrow, we'll see in 10 years if something better ...