I bought the Janome 7700 in July 2010. The features I like best are the large harp (quilted a large queen size very easily), the Automatic Plate Converter, and the good lighting.
I use the APC all the time, especially in garment sewing since I don't have a serger. I use a single hole needleplate whenever possible, because I think it gives me better stitch quality and prevents the fabric from being sucked down into the hole, but need to switch back and forth for finishing raw seam edges. My previous machine was a BabyLock Quest, which was a good machine except that changing the plates that had to be screwed down just drove me batty.
That being said, the APC has been problematic for some owners.
I haven't used many of the decorative stitches yet.
I definitely would buy the 7700 again.