Glad you're liking it -- and ditto, I agree completely. I really like the D50, fantastic little recorder, well built, solid construction, good features, very good battery life, easily field-replaceable AAs, digital-in for use as a bit bucket, and to top it off, really good sound on line-in and mic-in.
I've owned and used probably 15 or 20 field recorders, and the D50 is definitely in the front of the pack. I'd say the SD 7xx boxes are the top in their class of recorder, and likewise the D50 is the top in its class for the smaller hand-held recorders. I'm always recommending it, esp since it doesn't seem to get nearly enough use in our application. People seem to overlook it since it is a bit larger and a bit more expensive, which is too bad.
On a number of occasions, I've run: mics> Lunatec V3 (optimod)> D50 (digital in) and it is a great, relatively compact, high-end rig. I've put together a new 2ch rig and will be running: Milab VM44-link> EAA PSP2> D50 (analog in). First use will be tomorrow, and I've got no fear of using the D50 as my main recorder or as my A/D stage. From my experience with the D50, this will be an excellent, uber-compact rig to run.