Heat & Performance Experiences with Sager NP8678-S (Clevo P670-RG)

I'm trying to decide between the GT72 and the Sager NP8678-S (probably through Xotic PC). I really like the thinner, lighter form factor on the Sager, but I'm concerned that it comes with significantly more heat issues and/or long term reliability problems.

Can anyone tell me what their real-world gaming experience has been like on the 8678? Does it run hot? Does the build quality feel solid and durable?

Anyone compared it directly with the GT72?

Thanks for your time!