That’s how many of his I have recently studied. I love Keres games! He rocks!
I would recommend to any student to study Keres’ games. Why? Because he cuts through the crap of a position, to show where the weakness lies. With Kasparov’s games, no one knows WTF is going on except for the relevant combinations. Fischer had a penchant for peculiar moves in closed positions, but was sort of boringly “scientific” (to quote a word used by Ljubovevic) and technical. Kortchnoi was sort of conservative and anal-retentive in his style (he simply out-calculated opponents, for the most part, especially in dry, strategic positions, except against Karpov) – but you can still learn a lot from Kortchnoi, and I still like him. Karpov was extremely interesting, but as is often alluded to “Who can play like Karpov, but Karpov!?”
Also, Keres was not dogmatic, so you could always learn some wonderful positional lesson from him. Ocassionally, he might inject a suspect or dubious sac against a weaker opponent, but you still learn a lot from it and it has been extremely rare that he does it (except against Botvinnik, right? 😉 ).