Hey, a friend of mine recommended Testament, when I asked for some good thrash bands, I listened to a few songs and I liked what I heard. What are the must-get albums and what are the must-avoid albums of Testament?
Gear :

Jackson JS32T King V
Vox VT40+
Stagg C542
If by the Legacy you mean the New Order Andy, then yes I agree

but really there is a testament, thrash, and general recommendation thread you could have posted instead of making a new thread.
Formation of Damnation is pretty good too.
and I don't care if I live or die,
because I ain't ever going to no other side,
there ain't no heaven and there ain't no hell,
but I am a sinner so it's all just as well