First got this on the PSX, then later the PC version. The PSX port is missing some stuff, such as the custom units. The GOG version runs perfect, never had any issues or crashes. If you love the RTS era of C&C and WarCraft then you will obviously love KKND and have most likely already played it. All I can say is that it's still as fun as ever and I wish this flavor of game design came back.
Some people may call it nostalgia goggles or whatever, but WC2 is one those classic RTS games I just replay every now and then. Great campaigns. The art style still looks cool, GOG version runs like a charm and so WC2 remains the most iconic game in the franchise for me.
