There is clarity there, some could find it harsh as it is not a forgiving amp. It will let your technique show. If you you like BF Fender/Vox style amps you will be pleased, if you like a Marshall JCM800s then maybe a different amp is the order.
Speakers will play important role in finding the right top/bottom balance.

Nick

I played a blackface Super Reverb for years before switching to Dr Z Maz 18 and Maz 38's around 2002.  I like the Dr Z amps, which are in the Voxish category, with some Fender thrown in.  I have a Splawn Quickrod (similar to a hot rodded JCM800 in a lot of ways) but it's a very single purpose amp for me, and I have to really work to tame the high end.

I'm more of a Fender/Vox guy than anything.  I don't have a cab with a G12-65 in it, but I plan on buying one, or putting a G12-65 in my Avatar 1x12 1/2 back cube cabinet when I get the Overtone.

Compared to Fenders or Vox type amps... OTS is not bright or even harsh sounding amp.
I'm using g12-65 and with that I would describe the tone as warm and smooth with enough hi end to be heard in band situation.
 

I have been a pro or semi-pro guitarist for about 30 years. I've  used either a '72 m/v Twin Reverb or '66 Super Reverb for most of that time. I also got the Dr Z bug when I had some extra cash in my pocket.  I found the MAZ 18 to be somewhat voxish but that that characteristic did not really stand out on stage. The MAZ 38 did not sound voxish to me and not really any different for stage purposes, than the Super Reverb. The nice thing about both Z amps is that I was able to sell them quickly for what I paid for them. Top quality amps, no doubt, but it seemed that I could always find an overdrive pedal that would give me the sound I needed with the Fender.

I picked up the OTS in May, just to satisfy my curiosity about the Dumble tone. I have fallen in love with it since then. The Dumble tone is pretty cool, but for my work it is of limited use, so my love for this amp comes from it amazing versatility. It is very sensitive to various switch and knob combinations, speakers, loop devices, etc. It is a handful compared to a Dr Z or Super Reverb, but you can do things with it that cannot  be done with anything else but another d-style OD amp. The clean tone is really better than the Fender and it handles all sort of pedals very well. If you play live and need to use a variety of tones it may take a while to get all the settings right, but it will be worth it.

As to all the mods and speaker combinations you will need to hear it for yourself and then decide.

I love 5881's as well. Thanks to a few good peoplle here