Let me preface this by saying I'm not claiming BSL yet, however my hair when stretched does touch my bra (21 weeks post). I chose BSL though because for the first time in my life, I am wearing my hair flat-ironed STRAIGHT no bend, no curl and I think it looks amazing. At any other length I think hair that is completely straight (on me) looks unfinished or undone. So at other lengths when it nears wash day and I unwrap and my hair fell completely straight - it'd take me into panic mode as I tried to figure out what to do with it in the morning.
I also love the length of my ponytail - at midheight I can still feel it on my neck/back curve. The fullness of the bun - love! I've only been out of my sew-in for about a week so I haven't had a lot of time to play with it, but I'm anticipating when I'm full BSL I'll love it that much more. When my hair was CL/NL - OMG it was SO much maintenance! I won't even go there...lol.