I agree, leave it plugged in, it does make a difference. It gets fairly warm. You should have decent bass, especially compared to the older Modi.
I enjoyed mine, but moved on to a Project Box S FL. NOS multibit, filter less design and direct coupled. Has huge full, but not sloppy bass, beautiful flowing mids and highs, and also benefits from being warmed up. It's a keeper, smooth non fatiguing sound that has the musical flow the Schiit MB's lack.
The real surprise was the Maverick D1. Old school design, flexible, and awesome sounding. I swapped out the opamp for a Sparko discrete, and picked up a 1960's Tesla tube from a friend. Each was a small improvement, not earth shattering. Which IMHO says a lot about the out of the box design. I did order the Maverick upgraded version GE tubes, and better op amps. Frankly I think most would be happy with this configuration.
Comparing the Project S to the D1, they sound very much alike. A/Bing it's really hard to tell a difference. The Project may be slightly, and I mean slightly more refined. The D1 is much more flexible, and has USB, the Project only optical and coax inputs. The D1 USB Tenor chip is old school, sounds pretty good surprisingly so, but I would recommend a Schiit Wyrd, REGEN, of IFI USB. As the Tenor chip is not asynchronous. I use a Schiit Wyrd, along with a AQ jitter bug. Both bring the USB to the coax/optical performance.
The Project is simple, and solid if that's all you need, and will give you that organic, smooth sounding analog sound, with out the digititus.
My AMT3's and the Great Heils were made to extract detail, and the Schiit MB's forward midrange production, were not a good match. I may have been hearing things I was missing, but many times they were over emphasized. Interesting, but strange and fatiguing after awhile.
The musical flow was lacking, and frankly the timing seemed off on both the Bifrost MB and Modi MB, like it was speeded up, and just off the mark. Weird I know, but I found myself avoiding my set up except for a few minutes a day. Not good!! The Project and Mav D1 solved this with flying colors!!
I still like the Schiit MB's. Like most components, they are system and taste dependent. If matched right, I'm sure they can really shine.