I had a look at these a while ago - couldn't really make my mind up, largely because at the moment, I do not get to use plates in anger, so to speak. It is only by using them, that you would really get to know how they work for you
The basic idea of CatA only plates is a great idea for heles and slow planks, much less chance of getting the information wrongly interpreted. It must certainly reduce the chance of interpretation errors.
Like Timothy though, I think the simplification process may have gone too far in 1 or 2 areas, so that some useful info is NOT included.
Incidentally, the quoted website does allow a sample to be downloaded, for those who may be interested.
The mode of delivery of these plates via the www is certainly new, and an interesting way of disseminating such data.