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Yea, almost got one.. compared Fiio, M-Audio and Topping..
opted for the latter (their NX1s model) as what I read sounded good and it seems like good value for money and kind of a no-nonsense approach.
Still pretty happy so far.
Improves sound as well as volume of iphones significantly.
I also use it to amp the signal coming out of a 4-channel passive mixer. Would appreciate even more power there, but given the size and weight of the thing it's delivering quite a lot (did not directly compare to other headphone amps though).
Fiio do decent, little headphone amps, DACs, etc at the cheaper end. Although I probably stopped using mine when I stopped using an iPod.