#1
i was looking at a tubescreamer and i dont know if it would help out my sound and give me a better harmonix sound. i play metal i dont know when other people say that this pedal is great for 80's sort of stuff or like metalcoreish type metal.
#2
Wrong forum (try GG&A, I assume the mods will move it for you ), but the Tubescreamer makes a great boost if you're using a tube amp that needs a push. If you're using a solid state amp, it won't really help for metal (generally)

Which Tubescreamer were you looking at? The TS7, TS9, TS9DX or TS808? And what amp are you using?
#4
There really for blues, but i suppose they world work for metal with the right settings..
RIG
Guitars:
Fender American Strat
Carvin Bolt
Aria Fa 71
Epiphone Les Paul
Yamaha FG700S

Amps:
Hughes and Kettner Trilogy Half Stack
Marshall MG *hides*

Pedals:
Dunlop Crybaby