They're great pedals but they really need a great amp to work IMVHO. The original muffs are cheaper, and TRex do much better versions of the Metal Muff if you ask me.
Personally I think this is one for EHX collectors :roll:
Keep saving for that amp

BTW I tried the Rivera Chubster the otherday - bloody marvellous little combo for the money! :P drools :P