So you guys don't consider all email being PUSH important or am I missing some email settings on my Titan? I was pretty disappointed I had to make a Live account just to get PUSH email. I guess that depends on the person, but it was disappointing to me. I hope someday, WP offers PUSH to more clients than just Live.
Having said that, I prefer WP Mango over BBOS in most areas. Now I do have a Playbook running their new OS and I know there currents phones just aren't up to par. I can't say I really miss any type of notification center, since I get notifications on my important live tiles. I do miss my customizable LED though.

. I find it annoying the integrated twitter can't forward tweets via Email directly. One huge plus BB has is you have the ability to send email, sms or to twitter/FB from so many Apps and native stuff. WP isn't quite there yet in that area. The WP browser is pretty good. Its is fairly quick, probably close to BBOS7 devices in that area. I really wish WP had Flash, but I know BB won't have it either until their new OS is here. Yes, it will still have Flash even though Adobe isn't providing the mobile support anymore (for those that would say, how could they? Mobile Flash is dead?). RIM doesn't use a plugin like Android. Flash is supported at the base OS, so it also runs better too. RIM ports Flash themselves from the source.
RIM is one of the best for antenna reception and call quality. Now my Titan looks to have software issues where call quality is effected on my voice to the other end. However, my Titans earpiece speaker is noticeably inferior to what I'm used to on Blackberry's. Reception is similar between the two. Granted this is manufacturer issues, but RIM is pretty straightforward here. In general, all their models will be excellent in those areas. Also, my battery life on the WP is pretty good. No complaints there coming from Blackberry which is also top notch in battery for smartphones.
I'm a huge fan of the metro UI and I love that most Apps maintain that same look.
Holy crap, data! I used to use about 250-350MB data per month on Blackberry, due to their data compression. I'm looking at about 2-3GB on this phone. Not a big deal cause I maintained my unlimited data, but it's something to note coming from Blackberry and going to WP, Android it iOS who don't compress data at all.