I remember it well and your second.
I remember my 2 Jack 15 cabs as well, truly mega but a bit on the heavy side and awkward. I suppose in retrospect, I could have used just one of them but then what's the point of having 2.
What really brings home how good the Jacks actually are is when you go walkabouts on wireless and hear 'your sound' from the audience, it's everywhere you go. The same sound everywhere. No treble missing 'cause you're not in front of the cab and no diminishing of quality of sound over distance.
They have to be heard and used to be believed. A true leap of faith but well worth taking that leap!