Just wrote this up on the S/D thread. I debated putting it here too, but since you specifically mention the Tremond which is another of my absolute favorite "Rats", I felt I needed to put this here too.I've been kicking the tires on one of these, but I shouldn't spend the money. Or should I? Or should I get another Tremond? Or...?
Blower Box Deluxe Update - again all at 18v:
I spent time comparing ALL of my Rats today. The BBD definitely holds its own with its own unique flavor. It's definitely grainier than most, and I'm not a fan of that solo - but it completely disappears in the mix and just sounds aggressive. It's certainly the easiest "Rat" to get a nasty and cutting tone from - it comes naturally, even at 18v. This pedal is incredibly present in the mix with no effort. But it doesn't have the "heft" that some of the other "Rats" do.
Overall, I'd say this is tied for #2 with my Tremond. It really comes down to what I'm looking for. If I want aggressive, tight tones, this has it in spades. It's hard to make this as thick as my Tremond or Bass Mountain, though. But it clanks easier than they do, and there's no shortage of great, punchy bass. So if you want something for faster riffs that will pop out of the mix, this will do nicely. If you're wanting a thicker, doomier, tone, get a Tremond or Bass Mountain. They (Tremond and Bass Mountain) can both be punchier or more in your face, but are the inverse of the BBD - it takes some effort to get less thick distortion from them. Or if you want everything available (with some tweaking to get there!), get a Volt Thrower. I can get each of their distortion tones to get pretty darn close to each other, but the way they handle the lows is really the biggest difference between each of these pedals.
So my current Rat ranking is, in order, Volt Thrower, Tremond/Blower Box Deluxe (tied for #2 based on tonal need), and Bass Mountain. After that would be my Iron Pig, and then the Cat Tail (stock).