Nice article, Thanks! One thing for me, though...I've been playing dbl bass for some years now and I use dbl pedals as well as two bass drums. For me, I can get way more power and a more even sound using two bass drums, regardless of how good the double pedal is. It may be just all in my head and others may disagree, but that's what I always have found.
There are some venues we play where there is no room for two bass drums so a dbl pedal is a necessity. For those gigs, I'll practice with the band using the dbl pedal for a week or two prior so I get used to the slightly different feel.