Falcons are light, easy clenchers. A short piece of pipecleaner formed into an open ring serves as a moisture absorbent medium in the reservoir. They stay dry throughout the entire smoke, and are a 5-second cleanup afterward, involcing unscrewing the bowl and wiping with a folded pipecleaner, changing out the pipecleaner ring.
Kirstens are bulkier and heavier. They have a spit valve like a brass instrument. Apparently they can be emptied mid-smoke without unscrewing the bowl, but I've never needed to empty a Falcon mid-smoke.
I still don't get what about their design and construction justifies 3x the cost of a Falcon. Neither brand is going to win any beauty contests.