Hi - I got the 765 about a month ago. I absolutely love it. I am new to Bernina, but not new to high end sewing machines. I love the feel of it and the features are wonderful. I have no complaints. I wasn't interested in embroidery, so I got the 330, which I upgraded to a 350, which I also love!
If you will be using it for piecing, I highly recommend the new piecing foot #97. It is offset so you can get that 1/4" seam and the fabric will still ride over the feed dogs.
Oh yes, the dual feed is wonderful as well! I previously had a Pfaff Performance 5.0 which I sold to get the Bernina. I see no difference between the two dual feeds, they both work well.
I am happy to answer any specific questions you have, just ask!
Solomae