I know they are used as a total panacea by some professionals.
I have bought a few bits from Ebay, morning routine, behaviour in school and a calm down cue. They appear to work well for DS1 who has HFA.
Pros - it enables him to carry out the morning routine independently, which is fabulous because otherwise it is a massive, massive battle each day. (it doesn't have a symbol for pyjamas off though, which I think is an oversight and leads to him often going to school with jammies under clothes!)
He LOVES them, loves to look at the keyrings and read it through several times a day.
THe calm down one works like actual magic quite often.
Cons - we have to go through every stage of the timetable, there is no room for flexibility. So this morning he was up 10 minutes late, but still had to go through it all in order, at his own pace. And then didn't want his hat on, but did want his coat, because that is what it says on the schedule.
So, do you find them useful? Or do they hold your child back/ make them less flexible?
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Opinions?