I have the BSR and never use it. I begged my DH to get me a Bernina with the BSR so my FMQing would improve. He did, but my quilting was worse. I couldn't stand the thing. Now, it probably would work better if I got it updated (it is 5yrs old) but I don't think I would use it, so why bother?
I would say it you are looking to buy one, take a real quilt sandwich and your favorite quilting thread to the shop and try it out. That way you can see if it does starts and stops in a way that pleases you. That was my biggest gripe with the BSR.