I really like the BSR on the 440, as dunstr says -- it's very easy to learn quickly.
I did FMQ on my Viking, and had adequate results, but I never really enjoyed the process. I spent a lot of time with clenched teeth.
With the BSR, I love it, find it relaxing, and it's easy to get into a very zen-like state of creativity. Because I like it so much, I've done a ton of FMQ, and because I've done a lot, I've gotten better at it. So now when I use a machine without BSR, I do really pretty well. It's kind of like training wheels on a bike. You get quick confidence and good results that enables you to do it later without the extra help.
RST