I have a hard time understanding the educational value of the micro bit. It seems way to underpowered to do anything interesting educational wise.
5-11 -> Primary School
11-16 -> Secondary School
16-18 -> Further Education (often called college, or Sixth Form)
18-21/22 -> Higher Education (University/undergraduate)
Some secondary schools are large enough/have enough expertise to have a Sixth Form as part of it. Some children go to "preparatory school" until age 13 when they enter a secondary school.Blinking an LED? That's actually interesting. You can show your friends. You can put it in another toy. A child can do a lot with a blinking LED.
I'd say the same and the first two generations of raspberry pi, but the community and price trumped all.