I have been using LG G Pro Lite D686 since the last one year. My comments as under:
Large 5.5" screen(but its difficult to operate this phone with one hand and also its too big to fit into a pocket)
With only 1 GB RAM, it cannot perform multitasking smoothly. For example, we cannot play high end games like Asphalt 8 or Need for Speed without experiencing lags. Need at least 2 GB.
Heating issues when playing games and playing videos on Youtube.
Just 1 Ghz dual core processor cannot perform tasks smoothly.
Even if you wipe off all the applications from your phone using CM Cleaner, the RAM in use will still be 60%.
Power lock key not functioning so well.
Front camera has no clarity. Rear camera is very good.
The only few good qualities in this phone is the 3140mAh battery, 5.5 inch screen(clarity of video is good).