okay--look I work 40+ hrs a week in a studio...we use speedotrons (have 3 packs, actually getting ready to buy 2 more 2403cx's and 6 heads), we also have a half dozen or so totas/omnis, some softlighters etc. The speedo packs I mentioned get used every day. We haul 'em out on location, use them in the studio--even dragged outside occasionally. I'm using this lamented 2403cx now--for cross polarized copywork. It's on for 8-10+ hours a day sometimes , and we'll use every pack we have to do furniture sets or location work and do multiple pops until everything in the room is floating in front of your eyes....
as for dynalights--yeah, great packs--it's what I use for my own work. But I've never pulled a plug out without turning the pack off. Never plugged one in without it turned off either. I treat them just like Speedotrons for 2 reasons. One, I don't want to pull a bonehead move at work & kill myslef with an arcing pack. I worked as an assistant once in a stuidio where this guy had burned a hole in the wall by doing this and killed the power pack. Second, I don't trust it....sorrry, call me cynical, but that's alot of juice in the pack.
FWIW--the stuff I do at work? We do 8, 12, 16 pops sometimes and isolate packs to more or less pops as well. All 4x5 stuff with small apertures--you can never have enough power, and unfortunately Dynalites just don't cut it in a studio....great for the road, or headshots or hanging from rafters for ball games. Not so great for shooting mahogany furniture that's 7 feet talll by 12 feet wide with glass and marble all over the place...the best light for this is actually a studio full of 1K Mole Richardson fresnels, nooklites and mickey-moles....but we also can't afford to go out & refit completely. The speedos aren't fancy, but except for this one pack, man..they're rugged and a great value. You can get them serviced all over the place, and there's rental stuff to boot, plus the other studios in my system use them as well. . bottom line is that we're stuck using speedotrons for better or for worse...I like 'em personally and have thought many times of selling my Dynalights for a 2400 ws blackline kit.