I bought one and it melted down inside while on a ~40 minute car ride. I smelled something unusual part way through the ride and decided it was the truck in front of me. On the way home I still noticed a faint smell. When I got home my phone charge seemed lower than I expected it to be. That is when the light in my head turned on. Closer olfactory inspection identified the charger as the source of the odor. When I opened it up there was a pile of goo where some component once existed on the circuit board. Luckily my phone is OK. It scares me to think of what could have happened though, just because I wanted to save $20 on something has the potential to destroy my precious.
Stay away, or regret may be your companion.