more fuel for the fire<G>...
I use standard notation as a composition tool. I use Finale, but it could be Sibelius or even Notion. I don't expect to get a great MIDI performance out of it, I do expect to think in terms of harmony and counterpoint, things I have a difficult time doing in the PRV - probably cause I'm an old fart.
Once I have the basic composition and arrangement completed I export the MIDI file, or lately MusicXML file, and import them into Sonar. It usually sounds dreadful, but that's to be expected, music notation does not present an actual performance, just an idea for a performance.
At this point I have a choice - I can either tweak the data in the PRV or I can play the parts in from the keyboard. Every project has different requirements, so it's a coin toss - and sometimes I make the wrong guess<G>!
I stay in Sonar from here on out, except for audio editing, and that works for me.
If I need live players for a recording I will return to Finale to create the parts. Sometimes I just need to do some minor edits, sometimes it's a mess. This is where it would be nice if we had a rules based interface between standard notation and MIDI, but we don't.
For really simple sketches I sometimes use Sonar's Score View, but there are an awful lot of quirks. If they just made it work more like PRV - in terms of tools and work flow - that might solve the problem for some.
It is probably possible to do all of this in the PRV, and then export to Finale if a printed score is required. I lack the chops to do that.