Should I buy Garry's Mod?

Is it a good game? Hell yeah. It is so diverse. Many gamemodes - much fun.

Is it worth the time and money? I have 1500 hours so I think its worth it.

Are there still people who play it every day? yep more then enough.

Overall just what do you think of it before I purchase it? (whether or not I decide to or not to)

Nice game to let you make what you want. from many Roleplay games to TTT.