Blimey, Mighty Ape does some ripper deals on these headphones from time to time, Well pleased! Anyway, these things aside – for the longest time my go to studio monitor headphones for both movies and music plugged into an amp have been my Sony MDR-7505's. They have a very ‘authenic’ natural clear sound stage (a lot of directors use them on set), decent bass and what I'd consider precise sound delivery across the full spectrum. One problem, they're somewhat fragile but more annoyingly the ear pads disintegrate very quickly requiring frequent replacement (at least once a year!). Accumulated frustration pushed me to explore alternatives and after reading reviews I decided on a set of M50X cans and I'm well pleased I did! The build quality is excellent, being both solid materials yet very comfortable and decent quality long life leather pads. The 45mm drivers in these deliver top notch very ‘full’ sound stage. It's a warm kind of sound and hard not to love them. As far as using them with a mobile etc, I have no probs driving them to more than acceptable volumes with my iPhone, but to be fair the larger drives really do shine plugged into an amp and as such is were I'd recommend they get used most often.