I've had just about all of 'em. The only PPC I haven't tried is the Treo 700 but used the 600 and 650.
And, I'm a huge gadget freak. I even went to Circuit City one day after the 700 came out to "convince myself" I needed it. I wouldn't give up my 8700 for anything else right now.
chefwong, the 700's nice but I think after being a longtime BES user, you'll be a little disappointed. I found PPC's are nice but constantly require soft resets and typically don't have great reception as phones. But that's just my opinion