Maybe I'm just being ignorant, but the ISK-960B, HP-800, and SH-988 all look very similar to each other, also rather similar to the AT M50X headphones. The HP-800 may be lighter/more portable than the other 2 ISKs, but otherwise, they look very similar. Re Takstar HD 5500, someone on the Takstar thread (think it's Hal Rockwell) has them; there are very infrequent comments about those 'phones on that lengthy thread. Comfort is apparently an issue w/them. The pads are terrible and need to be replaced w/HM5 pleathers. Re TS-650, those are new to me. They look like upgraded HD5500's, but w/more robust earcup swivels (but same pads). I have the next-level-up Takstar's, the HD6000s F.S. on Head-Fi (w/replaced pads).