Answer 1: No one would know what you will think. You can wait 1 more day and let us know.

Answer 2: HD560S needs 9 mW to support peaks/transients of 110 dB, 27 mW to 115 dB. Not difficult to meet. But will be marginal for dongle. Dongles typically don't list detailed specs. Apple dongle output 31 mW at 32 ohm; 3.6 mW at 300 ohm. It is around that 9mW at 150 ohm; it will not meet 27 mW at 150 ohm. So it will depend on how loud you listen and what type of music/recording (and dynamic range in the recording).

Also, if you care about audio quality, $10 dongles (including Apple dongle) do not sound as good, compared to better dongles and desktop setup.