No worries whatsoever...unless their Titanium skewers, which yours is not. There had been some reports of TI quick releases not being able to hold as tight as normal skewers sometime ago, but that problem may have been corrected by now?

Regardless I have quick releases on my mtb and never had an issue, and I use to ride on some pretty rough trails up in the mountains of So. Cal.; but never did any radical jumps with it though, mostly because I didn't want to tear up the bike or me not because I was worried about the quick releases.

You do have to make sure their adjusted right. Follow what Panthers007 said above, PLUS the lever should start feeling slight pressure when the lever is half way between fully open and fully close AFTER you adjusted it has Panther007 said. Even if you don't tighten it properly the security tabs will keep the wheel from falling off, and you will be alerted that your wheel(s) have come loose when you hear a slight knocking sound everytime you hit a bumb.