Maplegrovemusic,
I just picked up my 1.7's last night so this is a very early comment. I am upgrading from the 1.2's. I have started out with tweeters to the outside.
My initial impression is that the 1.7's are much better than the 1.2's in a lot of ways. Sound details that I never heard before seem to jump out of the things. The bass is really much stronger. On certain tracks I can feel it which never happened with the 1.2's. The bass is not boomy and is very articulate. The different timbre of the instruments is noticeable.
I think that placement with the 1.7's will be a bit tricky and understand your soundstage comment. They seem to need more space than the 1.2,s. In my first night of listening I was never able to obtain a good solid center as I moved the speakers around. However, they are supplying so much more detail that I may not be hearing the center even though it is there.
There seems to be a larger sweetspot. Also, I noticed that when I sat outside of one speaker, I could still hear sound from the other speaker across the room. Very impressive.
Finally, I was worried that the 1.7's sounded a little bit clinical in the dealer showroom. In my home environment, that is not the case. The 1.7's are engaging and musical.
Time will see how they improve.