Leah Day says that an addition of 2" in throat plate doesn't make THAT much of a difference when quilting. I have a 6600 and I won't ever use 90% of the crap on this machine.Personally, I wish I had spent less and got a different machine---but that's me.One thing the Horizon has ( I think) is the ability to remove part of the bed to sew cuffs and what not. I hem my little boys pants rather often and I miss that feature the most with the Janome 6600.