Ok, I think I have to make it clear.
I am a PAM fanatic, with all the official OP catalogues since 2002, and a PAM rep fanatic since a few years ago, with 3000+ posts on the different forums and 20+ PAM reps.
I used to periodically distil and condense everything I know about PAMs (not reps) on an excel spreadsheet that I honestly think it is unequalled for the amount of info concentrated in such a small room.
I used to post it here, but recent happenings drove (and they are still driving) me out of here.
If you are interested, you may find it elsewhere. Go there and make a search for "PAM spreadsheet".
The latest version is 4.0. I recommend you download that version, no previous versions, as I added tons of new info and had a few bugs fixed.
P.S.: That is not a pictorial guide. Any single PAM reps of any given PAM models, and even different reps of a same PAM model by different producers, have their very special pros and cons.
On almost 300 genuine PAM models, I could not do any better.
...so far, at least.