I can't get into much about it yet since I'm in the middle of a move right now and waiting for the cabinet so it's not in much use quite yet but I can tell you a few things.

It is a very clean amp but the level of clean is dependent on everything you use with it, guitar, pickups, speakers, etc.  The amp sound you're going to get reacts to the character of the guitar, even more so than my regular ODS style amps.   I prefer to use EVM-12L speakers with it so far to preserve the clean.  After all, loud and clean is the main reason I wanted this amp.  It takes OD pedals well though if I want to go there with it. 

It has FET and PAB boost on the footswitch.  They are both like boosts as far as I use them.  As for the FET, pushing the front end with an extra gain stage on any amp is going to add gain.  It also has two LNFB feedback switches.  I haven't done much with them yet and have pretty much left them off:

Here's what Nik told me:
As for the LNFB, it's 3 way
Top (loudest) is no LNFB, mid is a bit, and bottom is full on.
They're for V1A and V1B, ie on each triode of the input tube.

If I want that super sparkly clean sound, use a strat on position 4, no FET, no PAB.  The amp is still going to be loud.  You also wouldn't want really hot pickups if you are going for that ultra clean sound.  In a world where a lot of the Strat pickups out there seem to be hot, distorted, or overwound to some extent, this amp makes you want to experiment in the opposite direction with your guitar.  I may experiment with different pickups or even just adjust  the height on mine a bit more.

The filter includes a "high" and a "low"  These are each seven step switches.  The high cuts highs (with different capacitor values) as you go up in steps.  The low cuts lows (with different resistors) as you go up in steps.  These are available always.  The high cut is especially useful when using a brighter guitar as this amp can get very bright, especially when using it with my Altec 417-8c Alnico speaker which has a large range.  They both seem very incremental in cut except for the highest position of the high cut, which really knocks out all the highs.  It think that one position might be good for a subdued jazz style.  I like to tinker so I may decide to change that one function to make it more in line with the rest.  With my brighter Strat, I tend to keep it on that next to last high cut position.  With my Les Paul, I cut less highs as the pickups are naturally darker.  This high cut filter is very useful when switching different types of guitars.  It is very similar to the multi-cap high cut mod that was talked about in the Overtone forum and I used in my Bluesmaster.

You can run it with the half power switch for lower volumes but I haven't experimented with lower volumes yet.  My earplugs are at the ready always....

Just ordered my SSS today!!!  Can't wait!!  hurry up Nik!

I'm all over it.  Honored that someone even recognizes my "style"

Yes. It has the same passive loop as the rest of the OTS series

Yeah, I can see where the SSS may not need it as much as the OTS amps, unless you are gonna run effects that need a buffer. The SSS has def got my interest, I may have to look into it come January after I make all my holiday season overtime money and get my money back from Uncle Sam

Plasticvonaband, you live in Tampa right?  You should come over and check it out.  I'm moving to Hawaii in a couple of months but plan to keep this out to play for a while.  PM me if interested.

27"