I'll do my best...
I do have the Max 250
View attachment 4120612
Not sure how it will compare to the 300; but I'm assuming it'd be pretty similar, other than the normal sonic differences between 1x15 & 2x10.
I'm really loving the amp so far, even though I don't get to push it very hard in my apartment (neighbors

). Not really sure how to describe the sound, but its very, sort of, Peavey-like? I like it personally, and every bass I've run through it has sounded great; especially improved are my active basses, due to having their own input. Particularly my SR305E & AEB10E.
Works fantastic with all of my Thunderbirds too
At first I thought I would just disable the tweeter with the switch & leave it off, but I found it more useful than expected, especially on my Thunderbirds that are down-tuned; I don't have to add more treble via the EQ to get the sound I want. But I do have to turn off the Kosmos-C (on-board octaver) for those basses, and usually the 5-strings, the lowest notes become too...unsharp? Not really muddy, but start to lose definition, I guess.
May not be an issue with 2x10s?
Not had any functional issues, everything's working perfectly so far, definitely happy with it thus far.
It does everything I hoped it would, better than I expected it to
Hope that might help out, some at least
...it occurs to me I may not have gotten a number when the last batch were given out. Unless I missed it?

(definitely plausible...)