[stigmata]

I think you can get some info from response times - I would never put very much faith in them, but everything helps.

Using the "raise any" by some players means that they have AA. There are one or two players I am 100% sure of this. If they do it, I get out of the way, quick.

Certain players play back at you really quick HU when they have a good hand. This is similar to offline tactics, where they are forcing you to think fast and make mistakes. When someone does this HU, I will consider the fact they have top pair, and certainly slow down my thinking.

I wouldnt trust any of these to even inform 10% of my decision but I will use them when I see habits in certain players. But to be honest, I think there are so many other variables to be aware of, that this one should be pushed down the priority list.