GRADOSR225x Prestige Series Wired Open-Back Stereo Headphones

Is it worth it to get these headphones when I'll only be using them with music coming through my iPhone and not with a high-quality audio system?

How are these with lossless digital audio sources like Apple Music with lossless enabled (on the computer not a phone)?

is the Grado sr225x iPhone compatible?

What are the key differences between the 225x and the 325x? Other than the headband and aluminum cups, any major differences in the 325x for audio?