Love the knife, great blade shape with lots of belly. I would say 4.5 if I could. Mainly because the lock took about 50-60 openings that were very firm to seat itself. It just did not lock up like it should have. However, after repeated firm reverse flicks to open it has seemed to settle into a solid lock up. No play, nice and firm. Overall, love the knife, great price on sale and it was very worth it.