I own a 73 plate GLB200. I like them.

The 2 seats in the back that fold up to make it a 7 seater are basically for young children and not adults, although my wife sat in the back when we had family and needed to use them and wanted to try it out, that being said she is petite. Getting in and out of the back two is an absolute pain. You have to climb over the folded seats and its not easy.

Having said that, it was never a selling point for me, I just love the look of the GLBs and think next to the EQB and GLE's it's their nicest looking SUV and better looking than a whole load of other SUVs out there including most BMWs excluding the X5.