EDIT:
Used it for about 2 months, about 1 or twice a week. Then it dried up. Disappointed, as I have read a lot of reviews that stated that you have enough oil in there to last you for much more. Did not buy another one, switched to the blue competitor's product and I found it to last longer with similar effects.
I have no idea about how good/efficient this thing cleans or if it actually protects the strings and the fretboard. This can only be appreciated by close systematic observation for the duration of maybe on year or more, and compare it to a control group that doesn't use it. I am just a guy who likes to shred from time to time, so...yeah. But I know that whenever I use this on the strings and the fingerboard, it lubricates them and the playing is much faster and easier. But the tone gets affected, it cuts some of the highs. Overall I will buy more.