I have used bottom line quite a lot for quilting and piecing. It does hold a great deal more per bobbin than a spool wound with a 'regular' thread. Many years ago I made some heirloom machine clothes. The very fine bobbin thread (which is the same/similar ) as bottom line. I think you either love it or hate it. I ran out of the color of bottom line while quilting and went and bought a similar product. Not the same--as far as tension. Yes when you use bottom line in quilting you have to monkey around with the tension. But that is nothing new, we all have had threads that needs adjustment.
When I used the bottom line in the quilt, once I got the right tension-maybe 2 adjustments, it continued to sew perfectly. When I used (aurafil I think) I had many adjustments, and was blessing out the thread. If you like what you use, then use it. I think bottom line is a poly or a nylon, which is very strong.