I hear the janome dual feed is better. You have a lot of features on your janome so are you looking to upgrade or just have an additional machine. I have the dreamweaver by brother (unity on the babylock side) and can tell you the detachable dual feed and all it attachments beat any integrated dual feed I have seen. it is very powerful with its own motor. You can adjust the speed on it. It does thick layers, difficult fabrics, delicate fabrics well. There is nothing the dual feed cant handle. The harps space is large, the lights are bright. If you look at the crescendo over the Aria it also has the sew straight laser and the penpal system which both features are well loved but I like the pen more. You can use these machines on the new brother dream frame as well for midarm quilting. The frame is very nice that I am looking at investing in one soon. I am not sure on the features of the 770 but i did sew on the 550QE and was not too terribly impressed considering the price I really feel like with bernina you get less for you money and are paying more for the name on the side of the machine, but that is just my personal experience, you have to sew on one to decide if it is for you but I have heard better things on the janomes and it seems like you have a good machine. I agree for me I would just keep your machine and spend the money elsewhere