I have never played out with these, not that there is anything wrong with doing that with them, but life has taken some turns and I have yet to have the chance. I would never use them if there were stairs involved!
I used to always use a Peavey Mark IV head with a kinda rare Marshall Silver Jubilee loaded with a single Celestion Sidewinder 15, but sold that to help fund the sb's, and have regretted it since. No regrets on the sb's, just in selling the Marshall, sounded great with no issues for the 25 years I had it, and was easy to move.