Hey folks,
Just thought I'd add my two cents when it comes to Reason. I use Reason with Sonar, mainly working in Reason for everything to do with synths and sequencing, then rewiring into Sonar to add recorded elements and replace some Reason instruments with VSTs.
My main thing is this: I have never considered Reason to be a proper DAW, simply because it never really dealt with recording stuff. (I haven't used Record, so I don't know how it has changed the dynamic of the program). I consider Reason to be a synth; a massive, almost infinitely versatile synth consisting of innumerable ways to make sounds, which I then put into my real DAW (Sonar in this case) and mix there.
Reason is amazing for a whole number of things: it has my favourite MIDI sequencer ever (and I've tried a lot, Sonar's is especially sucky), it contains so many perfectly complementary synths and effects, it's a very very handy way of messing around with a keyboard in order to find melodies while still being able to find the right sounds and its hardware modelled interface means I can just plug wires wherever I want in order to see what I come up with. The moments when I spot an LFO running quietly away and I route that into the filter freq. of another synth somewhere completely different are magic.
Reason is balls when I want to add my voice or my guitar. Just balls. Sonar, however, is amazing. So I plug Reason, this epic synth, into Sonar and play it like an instrument. I don't treat it like a proper DAW and I barely do any definitive mixing within it if recorded elements are to be used.
This post started to ramble, and I apologise