Honestly not exactly the best cleaner out there, as I haven't noticed that it's much better than some other products out there, but get's the job done. You still have to apply the pressure for cleaning, depending how much girt you have on your frets ... That being said, what I've noticed is that it does a very good job at hydrating the wood after use.
After using it on my Ebony fretboard, I can see that small cracks in wood disappear 15-20 minutes later after usage, which is always a good sign. Depending on usage etc, fretboard stays hydrated and clean for quite some time. I usually change the strings and do a cleaning every 3 months.
I would recommend it, but don't expect some magic rainbows out of it. It all depends on how you're treating your instrument and how clean are you.