It's that time again! Jim Cramer rang the lightning round bell, which means he gave his take on caller favorite stocks at rapid speed:

Merck & Co: "Look I like Merck's quarter but it's a slow and steady wins the race tortoise."

Exact Sciences: "What can I say, it's for real. It's obviously real, it just moved up $5. At any pullback I like it because it's a game changer."

Lockheed Martin: "No, it's not a sell. But you know what, I'm losing enthusiasm for it. I'm liking General Dynamics and Raytheon."

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