Okay, tried out some AT tips, and SHE3580 larges and a couple of sources. Not much and only 45 minutes of use perhaps but they do make a very good showing vs. the RT-1, the Elecom, and even B400 in a quick comparison. Stock tips seem a bit more bassy than the other two I tried. Decent stock tips; pretty generic but sound fine on them.
I'm already gonna declare them legit, real deal and a must try. Went to the Pharmacy and they passed with good isolation and so small in the ears they passed the under hat test easy and should be a nice sleeping in-ear being cheap, even less than flush fitting, and nicely sealed.
Likin' the Rock-It/ FA DBA-02 vibe though the cable is all black till the Y then white & black mix after it. Metal capped plug and Y join with good strain reliefs, has a tight fitting chin slider. No lip on the nozzle so just a slide on and stay on with grip thing going on there. Pouch is the same as the $99 Pioneer CH9T comes with which is fine here plus a 6.3mm adapter. Nozzle is about 5.5mm long and longer than the B400 nozzle so if you are good with the Brainwavz you'll be fine with the S2000.
At $25 they do have a 3-year warranty so who cares if they don't have a replaceable cable. Don't want it myself as that would hurt the size/fit. Nothing at all to complain about for $25