^ agreed 100%, ben! I bought the epi VJ head recently, and for the price in the UK, it's absolutely great!
Bear in mind that the UK price is closer to $200 at the current exchange rate, and at the USA price of $99 is quite possibly the bargain of the century, IMO. You almost need a bulletproof reason NOT to own one, as far as I'm concerned.
Granted, being valve it'll sound better with the volume control around 12 o'clock or higher- but it still sounds really good at lower volumes too (though granted it's not going to be a heavy overdrive at those settings), and being valve, you can boost it nicely with an OD pedal to get more drive.
I must point out that I haven't tried the crate powerblock- but I have tried the g1200H (whatever) head, and I really wasn't impressed. And it's a lot more than the powerblock.
:drink: