I too am a huge Janome fan. I have been sewing on the MC7000 for years and have never had any problems with it. I just bought myself the 10001 (the 10000 with upgraded software) in December. So far I love it, it is very intuitive and I have found it quite simple to use.
I did notice that the throat is a tad smaller than my 7000, so I probably won't be quilting a lot of large quilts on it, but may try some smaller ones. I am keeping my 7000 for regular sewing and quilting, but someday hope to get a machine with a much larger throat, maybe the 11000.