Since I have been doing my own hair, I never found it necessary to use them because my leave-in provides that shine that an oil sheen gives.
Yes, I do. I use green one (ORS Olive Oil). I use it for styles that rub-on oils just cant reach. For example... I coat my hair good with moisturizer & a shea butter/castor oil mixture before I put it up. But I leave my bun in for the week, so during the week, I spray on oil to the bun part.