There's all sorts of right in Rupert's posts though.
Rupert, (and other mtt grinders), do you go into timebank all the time and bring up OPR on the fly, or do you spend a minute or two of the sync break searching the people on your left?
I'm not exactly a grinder but I always OPR the 2 to my left or right if I'm getting towards the business end of a comp.
As Rupert says you can pick out quite a lot of info. For example if someone plays hundreds of 180 man comps you can be pretty sure that his push fold strat is up to scratch and he'll be shoving wide if he gets short.
All I do is note ABI, ITM and whether they're a winner or loser. Sometimes add a few other bits if something leaps out.