So I have found a really good deal on an Ampeg SVT 6 Pro used with the 8-10 cab. BUT..... I have read TONS of reviews since I started talking with the guy who is selling it. A good portion of the reviews talk about reliability problems. Some say it sounds amazing for a few weeks and then "craps out". Some say it makes a crackle noise after you play for a while at high volumes. But then others say they have found the tone they have been looking for for years. They say that they can't understand the problems that the other guys are having. Please help! What have you heard? Do any of you have experience with these amps? Thanks!