..having actually googled it, magic loop appears to be a way to pretend you are using DPNs with a circular needle, except with only three needles, which is too few DPNs. (I definitely had laddering issues the time I tried to do a whole cuff with only three DPNs because I had lost the other three.) So unless you're super-afraid of your needles falling out (which I've only had as a problem on metal dpns, never plastic, wood, or bamboo) it should not be too different, except that the cast-on always seems harder.