Before I got into RM, I was actually looking for a Balenciaga, however, during my orientation to FIDM (fashion school where a bunch of rich girls are carrying expensive handbags) I saw a lot of B-bags around with rips and tears and asked the girls how long they had em, etc. They told me not for long and that was when I stepped back from Balenciaga. (But I am still going to own 1 one day! I love the hardware!)
Anna, I've also heard that Bbags don't last for very long, if you're not careful with them. I took a class last year and one girl brought a beautiful turquoise Bbag with her to class most days. One day, I saw behind her, and I really looked at her bag. The sides were all ripping! Immediately when I got home, I did extensive research on the Balenciaga subforum, and yes the bags don't last very well if you're not delicate with them. That definitely turned me off from Bbags, as they're more expensive than RMs too!
I usually use my BBW MAM everyday to work. But on the weekends, I'll switch to my Wine or Dusty MAM depending on my outfit. So I'd say I switch out of them 2-3 times a week.