2012 15" cMBP here. I'm not looking to power 4 or 5 different things, but my current rocketfish USB hub can't even power a single external HDD. Any recommendations for a USB hub?
It depends what u intend to hook up to it. A 2.5"HD u *may* get away wo using external power but if ur having probs, most likely ext power is needed. There is no magic. laptop USB port can put out 1 amp the most.
Basically any of them that have an AC adapter would do the trick. Some may be able to power a single 2.5 drive, but most won't any none will power more than one.