Quickbursts are great, but a warning to clusterers....if you use more than 3 or 4 you're going to need a beefy system. I believe the original design of Twiggy's was intended for single motor ignition....they are 12V igniters...but that doesn't mean that the current draw is high. I just know from talking to David Bachelder (the owner) that more than three or four will suck up juice. But for 2-3 motor clusters, they work great. Lit up a pair of F50T's nicely in my 4-29SS. The video actually shows that one lit a bit late but not enough to mess anything up...great flight. I usually use Fire in the Holes (I know they're still in business, but do they still make the igniters??) for ignition of clusters. I've heard of them being used successfully in clusters of 7 blackjack motors. For my next cluster attempt I'm trying Magnelites, though...I want to get into dipping my own. Hope it helped.