They came in quick and they worked perfectly on my Eytmotic IEMs.
I'd always used the silicone tips that came with my Westone UM Pro 20's. But, as they aged, the tip fit on the nozzle got loose and they would stay in my ears every time. They probably weren't sealing as well, either. Westones have small 3.3mm nozzles, so the CP100+ inserts fit perfect. I was a bit concerned because the CP100+ tips were about 20% shorter than the Westone tips that worked best for me. The concerns vanished quickly because the CP100+ tips seal really well and let the Westone bass punch through. The CP100+ tips are also more comfortable than the Westone tips. I think swivel tip design is the reason that the SpinFit tips excel, as advertised.
I have a kind of wonky-shaped ear canal, so with some IEMs the SpinFit design is the best and most comfortable. Build quality and sound fidelity are very good too. They work, and work well; what more is there to say about eartips?
Infinitely more comfortable and better-sealing than the stock tips on my Shuoer S12s, with excellent sound quality. They're not incredibly grippy, though, and they tend to move around a bit when they get sweaty. Also, they needed to be stretched quite a lot in order to fit onto the S12's nozzle. Maybe these things are normal.
Wasn't the right size but my friend likes it