Well, go the Fusion this AM and checked it out with my other gear. Ran both Roscoes (fretted and fretless) as well as the Rob Allen, and swapped between my Berg AE210 and AE112 cabs. I have to say I'm very impressed. As others have noted, a very quick amp and it seems to have a lot of balls. I just ran it flat with contour off. Running some grit in the B channel was OK, but frankly not as cool sounding to me as the Aguilar AG500 dirty channel. But that's what VT pedals are for.
What is interesting is that with the MB head I preferred the 210 cab as the 112 sounded a bit too fat/inarticulate down low. With the Fusion, the 112 sounds killer and if anything the 210 is a little too focused. Now I'm wondering about a Berg 212 with this setup. I have a Thunderchild coming so that'll be interesting as well.
Cool...
A few thoughts...
If you think the 210 is too focused, I think you'd REALLY dig the 112's. They're definitely a bit wider sounding than the 10's and have more depth on the low end, tho unlike a lot of 112's I've played through in the past, they aren't overly "scooped". I think the Bergs are probably the punchies 12's in the mids, but these GK's, at a MUCH lower price are a pretty close second. I really like them a LOT.
There's a huge debate with the cab techies about the lack of batting materials in these 112's, but at least from a purely subjective point of view, I love how "alive" these cabs sound. It may not be studio accurate, but it works pretty darn well for me on the gig.
On the amp, yeah, it's got a big sound... and especially if you move from 10's to 12's, I'd be shocked if the contour appealed to you at all. IMHO, the contour is more useful as a control like the "loudness" on the old stereo systems... pretty much only useful at very low volumes or in very sparse mixes to fill a lot of space.
To me, the best sound this amp has, at least with the 112's, is pretty much flat, and depending on the bass/style/venue, maybe even dropping the bass just a tad, and boosting the mids just a bit. I never use the presence control, and I always leave the limiter engaged. I love the tonal protection it offers, and it is VERY musical IMHO... doesn't suck dynamics like those sometimes can.
Anyway... IME...
P.S. I have the newer Neo112-II's, but I've read posts that they sound pretty much the same as the older model.