I think their pricing is somewhat high for these otherwise I would've got one already (I wanted a Duo one), but from what I read, they're the well-regulated, high-quality models that output the proper voltage (or very close to it), so they are superior to the cheap, unregulated original models that the systems come with which can go 2-3 volts higher than what is actually stated. It all works out either way because of the internal voltage regulator which drops the voltage down to the proper 5V operating range, but it means more heat is generated reducing its lifespan. In short, they should be better than the originals and better for your system.