After a brief wait my SR-300LE arrived yesterday from Japan for $630 shipped. I let them energize while I listened to my Airbow SC-1's before a quick comparison. It was easy to quickly switch back and forth due to the SRM-T1S's two Pro sockets. Immediately the 300LE sounded a little louder, more upfront, and dare I say bassy, wow. I took a few measurements as well... 300LE AIRBOW SC-1 300LE vs AIRBOW SC-1 For the life of me I couldn't get them to seal to my coupler, and they had no Stax fart either. As @sorrodje mentioned in his L700 measurements, it appears they behave like Lambdas do when they have a broken seal, and the leak is designed into them to bring up the midbass at the expense of low end extension. Not to mention the increased distortion in the low end compared to the SC-1. I played around with a McDonalds straw and breaking the earpad seal when I had the SR-207/252 set, and ultimately let them go due to the grating treble. Once in a while when listening to the SC-1, I yearn for some MOAR BASS and break the seal for a few tracks, but don't intend to permanently mod them. The 300LE gives me that fun bass when I feel I want it, and can happily live beside the SC-1, and Lambda Pro in my Stax stable. I haven't heard any of the newer Lambda's (L300, L500, L700) so I can't compare how these 300LE fair against them. From memory I like them more than the SR-207 (that unrefined treble, OUCH), SR-202 (lacked technicalities, maybe it's age had something to do with it, but the SC-1, and Lambda Pro I have kicked it's ass in my book). My head is fairly round and wide (bowling ball?) so the lack of mobility in conforming to some people's head doesn't affect me, but I could see how it could be a problem for folks with a narrow head.