I own the Reflex 12 and an Etek 4 and I can say with certainty that the etek is way more reliable, consistent and efficient the reflex. IMO, when you buy an etek 4, you are almost buying an ego without the ego solenoid. That is a bold statement, I know, but I think to a certain degree it is true. As for the reflex, it is a smooth shooting gun and quite quiet, but it does not match the etek in the consistency department which is the most important feature for me.
You do not know what you do not know