but i knowing what amv101 will tell us. Thats right -i think a lot says thinks like 100% give -its give but not 100% ,i would say more its have a very smooth and fast response give. On coils we use different springs with different softness to archive the same results. Is the give 100% you dont get the needle in the skin ! And after trying the centri v1 and v2 and later the magnet upgrade i was very unhappy. After a few days of use the machine breaks and after repair its never run like new. Always the magnets solve from the body ,my other machine thats was running i have sell fast before they breaks too but the buyer write me later thats the machine was not correct running too -he have running a other thast different works. And i knowing a lot thats was very unhappy with the v1 and v2. I have never try a cobra because that.