I would go for the Etek 4 over an Etha. The Etek is pretty much based on an older Ego which is Planets top of the line gun. The Etha is more of an entry level gun so its made to a budget. I found that when I had an Etha you could feel the vibration of the spring on the bolt when you shot.
The Etek has a nicer shot IMHO. I think the grips are much better too.
The Etek has a nicer shot IMHO. I think the grips are much better too.