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Pro Excellent value for money
If you blew your budget on difficult-to-drive headphones and are looking for a budget DAC/AMP, this is one of your best bets.
Pro Comes with a toggle-able bass boost switch
Pro Supports up to 24-bit/96 kHz output
Pro Has line-out
The E10K comes with an line-out output, so you can use this purely as a (decent enough) DAC if you choose to upgrade to a better amplifier..
Con Bass boost could make for a muddy sound signature
The bass boost might not be for you if you prefer your bass to extend low without potentially overpowering the mids (vocals). Fortunately, it's a switch that can be toggled, so you can go with what you enjoy the most.