The Honor 5X is still one of the best deals out there when it comes to budget smartphones. The only issue I ever had with this phone is the way that EMUI handles performance and multitasking in the stock software. You have to actually go into settings and disable the aggressive power saver mode...
If you want the Play Store and other Google applications to run on CyanogenMod on your phone you have to flash a G-Apps package separate from the CyanogenMod rom. The actual Cyanogen OS comes with a whole different set of stock apps called Cyanogen Apps. These are their own version of normal...