yes i have it and ive used it many times, it works great. just make sure to shake it really good and add it to warm water with a few drops of dish soap and/or rubbing alcohol. you can also add some hydrogen peroxide too. shake while your using it and make sure all surfaces of the leaves (top and bottom) get soaked. if you have something that sprays with a bit of pressure like a spray wand, use it beacuse it will help knock off mites. you can altrnate between the oil and something else like pyrethrum spray so the mites dont get immune. make sure you spray the plants right before lights out and after a day of light spray them down again with fresh water to rinse them off. make sure you do at least 3 treatments within a week to make sure if any new mites hatch they are killed.
do not use any type of sprays during flowering!!
also use your hands, you can take a cotton ball and dip it in some neem oil/ warm water and just wipe the mites off the bottom of each leaf. it might take a long time but it must be done if you want good buds.
any other questions just ask.