No disadvantages here! I don't own a rio or woody but my 5v luicy juicy bottom feeder is a top notch performer for me.
great bladder feed system, super clean internals, solid horn switch (5amp) and hits like a train with a 3 ohm boge.
it's my understanding it is outfitted with an LM1084 5A fixed linear regulator at 5v. I may be wrong but there is definately a well constructed chip set engineered into the box below the batteries.
Oh! Great price too!
got a boggers mini BF on it's way too looking forward to the vape mail