Early incarnations of Drumroll used the HTI motors, but they were terrible. I got them because they were dirt cheap, but I was usually burning out one per fight, and went through six to eight of them before getting frustrated and converting to Speed 900s. It was my first foray into spinning weapons at the time so they were subjected to inexperience to a degree, but the bottom line is that they're not really suited to FW spinners. Not sure what they'd be like as drive motors though...