I have not heard any of those three, and have only heard other select products from each manufacturer, so I really can't comment. I may be able to hear the Roxanne universal at some point in the future, but am not sure I will hear the K10.
Yes, I was surprised by the low price and like the smaller form factor, if for no other reason, because it is different. I do think I get less looks in they gym since it sits further in my ear.
Perfect Seal has a storied past, designing and making branded and non-branded CIEMs throughout the years. I believe the soft canal is the same as the Westone.
Another question. If I buy a pair of secondhand CIEM and have it reshelled. Would it change the original sound?