Does it help you gain way more strength/speed and especially more EXPLOSIVITY?
Im talking about isometric with 100% capacity of your strength or 110% for 2-3 seconds burst
I already implemented them in my training schedule but i need some more answers 
It is a good technique for getting past sticking points but I donāt think it is as effective for gaining strength or explosiveness as some advocates like Jay Schroeder suggest (I actually used his approach for awhile and did not see much improvement).