#1
i just bought one today, and i'm wondering if anyone else has one? i want a setting that sounds similar to metallica
#3
I have the UM100 - don't know how the 300 differs.

I don't really use it but I managed to get a decent sound out of it without much trouble.
Wouldn't know about Metallica, but it's a Boss MetalZone rip off and you can get a load of settings for that, including a Metallica one.

Maybe in the Owner's Manual: http://www.bosscorp.co.jp/products/en/_support/om.cfm?iCncd=292&ln=EN&SearchBy=RcId&dst=P&iRcId=0000010492&dsp=1&iStcd=4
Main Gear:
Ibanez RG550EX
Ibanez S470
Epiphone SG CS Ltd Ed 1966 Reissue
Cort M200/WS
Richwood RS17CCE acoustic
Hayden Mofo
Harley Benton 2x12 Celestion V30

My Band - Haemasmtha
#4
Owner's manual just has a generic "Heavy Metal" tone, but it transfers to UM100 pretty well and I got decent-ish Slayer / Lamb of God type sounds.
Main Gear:
Ibanez RG550EX
Ibanez S470
Epiphone SG CS Ltd Ed 1966 Reissue
Cort M200/WS
Richwood RS17CCE acoustic
Hayden Mofo
Harley Benton 2x12 Celestion V30

My Band - Haemasmtha