I have had the Governor, I currently still have the Black Powder, Cannabis Rex and - in my Krank 1x12" - a custom Legend.
Governor - similar to the V30, a bit more focused and more aggressive. Perfect for hardrock/metal.
Black Powder - bright, glassy, subdued mids and bass. Great for superclean sounds, chiming chords or low-tuned metal sounds.
Cannabis Rex - super round and fat sound, powerful lower mids and bass. Great if you want to tame an ice-pick heavy amp/setup.
I think the Governor is a speaker that would appeal to most people. If I wanted a very fat and big sound, I'd probably go for a 4x12" with two Cannabis and whatever more neutral speaker fits (Governor, Wizard, Texas Heat), if I was playing in a death metal band I would go for a 4x12" with two Black Powders and either two Governors or two Texas Heats.