Saitama's Powers

Saitama, the main character from the anime (One Punch Man) has gained a lot of popularity since it's anime came out. He is known to be insanely overpowered with immeasurable strength, speed, reflexes, durability etc. I highly suggest you watch the anime called One Punch man it is very entertaining and has good supporting characters. So, do you think Saitama has a limit to his physical attributes? Or do you believe he has unlimited strength, speed etc? Post your replies!