This is a very good question. I wonder about it as well. Are those new amps not coming with Mallory 150's? If not, I would expect they would be a good upgrade. And the Sozo's aren't that much more expensive, considering you are going to be in there soldering on the thing anyway...
Where can you buy this amp? I have been looking online today and it is not listed on the Guitar Center website. Musiciansfriend.com says the amp is discontinued!