Hi Guys, I just started getting professional bass gigs last year after being a guitarist for ages, and I'd like to buy a Tech 21 Sans Amp. I don't want to waste my money though so I'd like to ask for everyone's opinion before I purchase one. I heard that the new ones don't hold a candle to the old ones. Is this true? Should I look for an old one on Ebay instead of buying a new one? If so, how can I tell that it's old enough to be one of the better sounding ones? Is there a serial number or something?