I’ve used this lemon oil since 2015 and my bottle is still left with maybe 65% of it. It improves the feel of the fretboard and it also makes it easier to bend the strings on an electric guitar. I condition my fretboard whenever I change the strings. So, I first clean the fretboard with the clean and prep (I reckon that’s what it’s called), wipe it dry, let it evaporate and then follow with this lemon oil. I let it sit for about 10 minutes before wiping it clean and then install the new strings. Yes, you definitely will feel a difference. If you have a guitar with a rosewood fingerboard, I highly recommend buying this. Depending on how many guitars you have, it should last you a very long time.