I'm also hesitant to be an early adopter, but I've been really happy with the droid so-far - and coming over from a bb curve. My droid did the random restart thing a few times on day 1, but not since - so I'm chalking that up to early kinks, but I'll swap it if the problem proves to be hardware related (i suspect that it was not).
There's lots of reviews to tell you about the phone details, but a few things I love that i didn't realize I would...
-the number of good apps (that are free). There are so many cool things to do with an open development system.
-the virtual keyboard (surprisingly) - i wanted the droid to use the physical keyboard, but find the predictive texting to be great, to the point i briefly considered swapping for the eris or passion (later). I've since found times that the phys-keyboard is really nice to have, and it works well enough.
-the flexibilitiy of open development. I dragged my ringtone folder from my blackberry onto the droid, and they immediately show up in my ringtone options. no special folder, no renaming, etc (if you've used a PSP, you know how this can work poorly)
-build quality is superb. feels like a tiny netbook, not a phone.
things I'm concerned about.
-battery life so far is a little weak. I'm diagnosing with some tools to see, but so far, with (admittedly heavy) daily use, phone is 100% at 9am, and down to 15% by 8pm.
-early software kinks as the 10000 apps have to contend with new software (2.0) and hardware (droid) at the same time. So far, it's been relatively flawless, but something to consider.
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for tunes syncing...(i think this works, I've just installed it, about to try it)
Sync, Play & Send to BlackBerry, PSP, iPod, iPhone with doubleTwist
re: app memory.
most apps seem to be in the 256k - 1.2MB range, so i think you can really load this thing up before you start to run out of space. i could be wrong, but I anticipate that (as with my curve), i'll have a core group of apps (15 or so) that I cant live w/o, and another 20-30 that i try and keep or dont, but wont find their way into my workflow. i cant imagine a situation where I'd run out of space.