Yes i do, and nope you can't... lol
My girls love them, Ayja spends lots of time using them and so does bailey when he comes round (hence i am getting him a set for xmas)
They have been great with teaching them letter sounds and recognition, and now paris sits at the breakfast bar and when writing can have a quick look over and remember exactly how to form it.. i will say though that as we have the upper case ones (the first ones available) she is better in recognising upper case. So if getting them, go for the lower case ones.. at the end of the day it's more important to be able to recognise lower case.
We got ours from Kmart, but you can get them warehouse, farmers, toyworld.. lots of places.
- Ayja took paris's lead and at first we would show her the letters that started our names etc, M for mummy, D for Daddy, A for ayja and P for paris, and bit by bit she could point them out to us when asked and she went from there.

Totally recommend them