Out of large curiosity, what is the divergence like on the Rayfoss 600mW?
Anyways, to the poster, I would probably have to tell you "NO" to the O-like 400mW.
I bought a 400mW module from O-like. It would output over 400mW, but the output was everywhere. And I mean everywhere. It would walk from 200mW to 450mW. Not very stable. Unfortunately, that wasn't the bad thing. The bad thing was the beam. Horrible divergence. I sat on my deck beaming a hillside at 500 yards while adjusting the focal lens, and I want to say the best it could do is over 2mRad, probably 2.5mRad, but I'm guessing. My 200mW pen module from O-like had a better beam, and the dot on that smaller module could be seen much further away on trees than their 400mW could because of the difference in divergence.
I would probably say that the 200mW models from O-like are about the best quality beam for the money that they sell.
My 400mW module is heading back, because it crapped out. Output went down into the upper 100mW range. I'm not sure that I will be asking for a direct replacement. I think I will swap it for something else from them.