I just recently bought a Black Knight Rad Cushion grip. http://www.blackknight.ca/en/products.php?id=196 Is all grip the same, and do you think that one is good?
Well to answer your second question no not all grips are the same. Some are more durable, better at absorbing sweat, tackier, etc.
Ive tried this before, its a replacement grip. Mediocre tackiness, but feels pretty good. However if you have sweaty hands, it'll do a good job of absorbing your sweat but its not really tacky at all. But really depends on if you have sweaty hands or not.