Yes I have used them, they are good but you need to know what to do with them to get the best results. There is a LOT of them to play with, many with just subtle changes and they are dry so you need to put your sampler through a mixing desk with good effect sends. Whether they are worth the money, well if you thought about creating them yourself and hiring an orchestra then it makes them quite good value!! Solo instruments are good, strings are "ok" but I prefer everything out the box and ready to go.. these seem to need much thought put into them before you can get a nice playable warm keyboard sound...