Get the Nauticam version, for sure it will work with EM-10 (for the right lens). To the OP, I guess that what you want (small camera, completely versatile on a single dive and quality of DSLR) is very unlikely. I shoot the EM1-II and like it a lot, but it is not quite the same quality of a DSLR. Also, when you think of wet lenses, they are never quite as good as a prime lens in the appropriate port.
While I appreciate you taking the time, your reply is not really very helpful. I specifically asked about the SWAL. It is a LOT less expensive than the WWL-1. I want to know about the SWAL. I know the WWL-1 would be better, but I am not prepared to spend that much money on a lens for my (old) E-M10. I can't find a used WWL-1 anywhere. I can get a used SWAL for roughly $250.
Also, the same suggestion (for a WWL-1) was already posted in this thread.
And, the OP is over 2 years old, so he has probably already made his decision.
I don't mean to sound like a jerk (and I know this is probably coming across that way, for which I apologize). I'm just saying that I asked specifically whether a SWAL will work (decently) on an E-M10. I don't need suggestions for a lens that will cost me 4X as much. I already know about that one. That is not my question.
If were really thinking of spending over $1K on a WWL-1, I would start be getting a better camera and a Nauti WACP (even better than a WWL-1).
I'm just looking for something not too expensive that might be better than the Meikon WA wet dome I am using now. And, at this point, I think the SWAL is probably not it.