Picked one up from Duffy's guns yesterday as I had seen some great reviews on-line.... They are actually made by Umarex under license. Feels and looks really nice (to me) and I hope to get it to the range in the next few days to try it out. Of course, I really want the 5.56 version which is expected in the US later this year (drool...)
The arx160 is not fully ambi - you can swap charging handle but not ejection. However the shells appear to eject slightly forward so I have no problems shooting it left.
It is heavier than other 22s but it is supposed to be since it is a trainer for the arx100.
Sure hope it ships before oct so I can get one!