I had the Janome 6600 in my home for about a week and returned it. It wasn't a bad machine, I just wasn't in love with it. The even feed on it was not at all comparable to a Pfaff, even though I was hoping it was.
I decided on the Brother Innovis QC 1000 for a larger harp machine and it is miles beyond the Janome. The price is also comparable. I wasn't sure about buying a Brother, but this machine has changed my mind forever. It's top notch in every possible way. It has a mind blowing array of features and the stitch quality is superb. Check it out if you have a dealer in the vicinity...even if you have to travel a bit.
Just for the record, I also have a Pfaff 2056 and a Bernina 440QE, so I'm comparing it to top notch machines.
Good luck and have fun searching!,
Lyn