Web browsing 45-50c ? Hot?

I just picked up a 0 Nexus 9 from cowBoom.com. It overheats for me after web browsing . using cpu temp app it idles at 30c but when using web browser i get average temp 45-50 c. At 50c it is uncomfortable to me for me to hold it's most hot just below camera. HTC says they'll swap it out if I pay shipping one way I'm wondering what are odds are replacement won't have problems and if replacement does have problem, if I'd be able to get away with sending replacement back to cowBoom if I'm still under 2 weeks return window. It appears my Nexus 9 is a October build according to website where I punched in my serial number.