I personally find that putting people on ranges by their VPIP/PFR stats is not all that helpfull.

I mean, sure it's helpful if you're multi-tabling and you can quickly see if they are a 74/5 donk, a 55/40 maniac, a 10/6 nit etc etc but anything more than a generalisation is close to useless IMO.

You're much better off just REALLY observing the game, noting anything "out of the ordinary" for any particular player's basic playing style, and taking note on their postflop game rather than looking at the difference between a 24 vpip and a 28 vpip because as mentioned above, you could have 3 24/18 players all playing completely different hands in completely different ways, in completely different situations.