Ive had both the HE560 and He400se. The big difference to me was the HE400se was good on a phone, but didn't scale to sound any better when connected to a good stack. The HE560 requires a good amp and sounds better with bass and sound stage (enough depth for gaming, unlike the Sundara which is really wide but really shallow). Trying it with a Soundblaster AE-5 just for kicks, the HE560 treble was grainy and bass MIA. If you're looking for a low power headphone, the AKG K371Pro I had last week was way nicer than the HE400se since it had good bass response and I couldn't get it to sound any better with EQ. On the amp it was nicer, but on the Motorola Power G phone I wasn't complaining, really nice. The bluetooth version wasn't as good, like they tuned it for battery life, instead of the original fun factor. Also it has less sound leakage than the HE400se and I'd actually wear the AKG out in public of the two. If you want the planar magnetic sound and want to use it on a laptop or phone, the HE400se is the best planar for the money.