Here they call them tepigraphs or tephigrams or something like that... They are very handy for getting the cloud TOP height and the freezing level, and the stability (the lapse rate).
The problem is that the data appears only about twice every 24 hrs, and the 0000Z value isn't going to be very representative of what to expect at 1100Z during the day
But for a flight at say 1400Z it is very good data, IMHO.