One of the gals in my machine class the other day had one - she had upgraded from the 6600, so she was familiar with the Janome per se. She complained that the stitch selection method on the Horizon was driving her nuts. She constantly "overshot" the mark with the dial-in wheel on the front. Others in the class said that they decided not to get the more expensive Horizon because they did not see that much advanced features compared to the 6600.
So I'm just passing on the info - something to try on for fit.