Cramer: No doubt about it, this stock's in the sweet spot

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:

Chegg: "It's a $5 stock, can't really get out of its own way. There are too many other growth stocks that I'd rather see you in. Sorry."

NetApp: "I'm not a big storage guy right now. I just think it's become too commoditized. I'm not going to go there."

Digital Realty Trust: "You know how much we like that stock. We have been recommending that and it just keeps going higher and higher. I don't want to give up on it. Technology related real estate is very hot."

Westinghouse Air Brake: "I saw several number cuts this week off of truck sales being weak. You can hold on to it, but I do not expect the prospects to be that good in the near term."

GoPro: "We don't care on 'Mad Money' where a stock has been. We care where it is going to. I think GoPro has very limited upside. Of those ones — GoPro, Fitbit and Twitter — I'm going to actually say buy Twitter. Whoa!"

Office Depot: "No, keep looking don't buy because that is a very challenged group. I saw a note today about Amazon wanting to come into that group very aggressively. Let's hold off."

NXP Semiconductors: "People are giving up on NXP. We had the company on, we decided we liked it after listening. The stock has come down a great deal, so we have been buying it for our charitable trust. There's no doubt about it, NXPI is in the sweet spot, because they are in the auto not just the cellphone."

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