I use AOMEI Partition Assistant Standard...works flawlessly...and it's FREE
I've cloned MANY drives with it, OS and all, and works great for me...
I just recently built my new rig (see specs in sig) and cloned my entire hard drive with Win 8.1
on it and worked flawlessly...
http://www.aomeitech.com/aomei-partition-assistant.html