This is a fine collection of Chekhov's four most famous plays.
The Seagull is my least favourite - it's concerned with the theatre a little too much for my liking. The ending is great, though.
Uncle Vanya is the kind of thing I would have devoured in my early twenties. It's borderline existential the conflict between the old and the new (or the pretty and the ugly) is something that has always fascinated me.
Three Sisters feels to me like the most iconic of these plays - not being familiar with it I still felt like I have seen echoes of it in other works. It reminds me a little bit of The Iceman Cometh in terms of the grass is always greener / I am going to do something about it tomorrow attitude of many of the characters.
To me, The Cherry Orchard is his masterpiece, both hysterically funny and profoundly moving. I know people like this and have, myself, behaved like this at times. I see too much life reflected in it.