Almost a month in with the phone and OS, and I will say that my feelings on the platform have stayed true, if even perhaps slightly improved.
I am still very pleased. The lack of flash has been a total non issue for me. The main complaint is still the multitasking issue, and the way IM works because of that. I have alleviated that somewhat by simply using text, so I can deal with it, even though a fix is most likely coming with the new update.
I am still amazed at the "buttery" smoothness of the OS. Not a single hiccup or reboot since I have had it.
I actually brought my Milestone x (droid x) to the office today as I am going to list it on ebay most likely. I had been using it as an alarm clock, and had not really used anything else on it. When I got to work and slid the unlock slider I got immediate lag (again, not HUGE lag, but it is there), and had to reboot to get it to running smoothly (comparably). This is something I have not experienced with WP7, and something I will not miss.
Edit: cant remember if I mentioned it before, but if so, after a month this also holds true. I think this is the best on screen keyboard (stock or otherwise that I have used) among the three platforms that I own (droid, iOS, wp7)