I strongly urge you to take a look at PT’s discussion group — particularly the entry HERE!
I have made the mistake of not checking the group too often (that has changed now). I find that the discussions can get heated. I thing there are a number of Revenue Control companies that may be a bit embarrassed.
I would note, however, that the ones that get kudos are being hyped by their own employees. — bad form guys.
This thread has been going on since the beginning of the month. These guys can be viscous.
The companies named were Skidata, S and B, Amano McGann, iparc — these folks are so frustrated they are considering building their own systems. (By the way, not all the ones listed here were given negative reviews.)
Check it out.