I purchased a IPad Pro 12.9" and Apple Pencil about 2 weeks ago. Both work great. However it would be nice if the pencil would work on my iPhone 6s+ and older iPad 4. I tried a Adonit pixel point touch stylus. I worked on the older iPad and the iPhone 6s+ but lines were way off on the IPad Pro 12.9. I have been sketching for years and if you look in my art box you will find a collection of old pens and pencils I have liked and still use when needed. It would be nice to have a choices in tools. One is not enough.