I had the same set up (it was a Juki instead of Janome) and I have to tell you, I didn't like it. Some people like it just fine and others complain that there's just not enough room when the quilt is rolled up in the harp. They take up a lot of room and take a long time to load onto the frame (altho there are gadgets and ways to make this easier) and there is a bigger learning curve than you'd think. I don't know about the sure stitch.
I'm sure you will get as many opinions about this as there are owners! Best of luck to you!