So, I got the IGO-S in the mail today. I had wanted to see about it's viability on my REO Grand. It is viable for fit, air hole location and so on. I drilled out the center post and replaced the pos. screw with a shorter one. (I happened to have one. Otherwise, I would have cut, filed or sanded it down.) So the juice comes up the center post and out the two holes that were supposed to be for capturing the wire. I must say that the RM2 is hands down the superior atomizer. I just like to play, and wanted to explore options. The air hole is a tad lower than I would like. (I believe this "air hole height lottery" is a common theme with both the IGO-S and the larger IGO_L.) The vape is fine.
Here's what it fits and looks like on my REO.





Here's what it fits and looks like on my REO.







