Using this humidifier in my guitars, working perfectly. I tried sponge humidifiers before, they spill, hard to determine an amount of water needed and you must store your guitar case horizontally which is not comfortable in small space, especially if you have multiple instruments.
Oasis humidifier (I don't know why they call them "Taylor", it's Oasis company who makes this humidifier and it's their brand on the package) eliminates all these problems, no spills, no storing issues, you don't have to take it out and it humifies well.
Important note for people new to this type of humidifier: you must replace crystals every two years, after two years of using they stop working and it will spill. So make sure to replace crystals timely.