I always forget about the Whetstone, I'll keep that in mind.Yes, the Blackout Whetstone is a super-deluxe small-stone and the Sibling is the scaled-down version.
It's not a clone, but the circuits are fairly similar and they're not that different sonically.The Dod is a phase 45 clone so you'll want to avoid it.
I love mine, especially the with the Manual function. Sounds great after OD and fuzz.EHX also has the Bad Stone now.