I rented all the common mic's, and did many IR shoots using the standard mic methods as if I was playing a live gig and putting a mic on the cab and/or recording in a room in a studio. I then did many IR shoots using a reference mic in all the same positions and also with various positions around the room, up to 20 feet away from the cab. Comparing side by side, the IR's taken with the reference mic are more clear, more open, and just more definition. It is also my opinion that they sound better as there is no exaggerated frequencies or proximity roll off. They still sound very similar to the IR's captured with coloring mics, but cleaner and full, I will always be using a reference mic or capture from here on out as it's a better base to tweak from IMO.