First of all I'm a huge speaker nerd, and have spent way too much time and money on my speaker journey... But it's when you get speakers like the BV-25M, put a 57 in front of it and listen back to the recording, you realize that it's all worth it! Man oh man what a sound, it's hard to believe how "finished" it sounds with just a single 57.
Compared to Celestion's medium magnet offerings which I have always found lackluster (with the exception of a few vintage Blackbacks), the Mojotone doesn't have as much as a hint of harshness, and is silky smooth without being toothless or dark. It has a certain "polish" to it that gives off a little more of a modern vibe, not as dark and veiled as a Vintage 30 but there is something distinctively Vintage 30-like in the response and how even and smooth it is. I'm not saying it does vintage tones poorly, but it is more of an idealized take on the Greenback tone than any actual Greenback I've ever heard at least. Which, IMO, is not a bad thing at all, but to some people maybe it is.
If you've struggled with fatiguing and harsh upper mids from Celestions (all the ones I've tried have more aggressive upper mids than this one), this is the best "de-harshifier" I've ever heard. If I ever need more G12M style speakers in the future I will buy these again, again and then once more.
I took off one star for quality, because the cable lug plate is not very rugged. If you don't solder but use cable lugs, it will move back and forth when you attach the wires. But as long as you're careful I don't see why this should yield any practical issues, just something to be aware of.
Edit: After some more time with it I realised it wasn't as great as I thought, it's not a bad speaker but it has a very rounded upper mid range with not much bite or forwardness. If you have a really bright amp it might work out great, but if it's more balanced or on the darker side I would not recommend it.