Advice to improve my sketching on an Intuos 5

Around 2 years ago, I looked into getting a Cintiq but at the moment can’t justify the cost plus it takes up quite a bit of space which I am a bit short of. Then I borrowed a Surface Pro 2 for 6 months and thought that it was okay, but the screen was too small. I also got the Wacom creative sylus for my iPad 3 - thats not bad but the nib is a bit clumsy and I have to keep my palm away from the screen. I’ve tried the iPad Pro and pencil in the store and I think it is pretty amazing. Although, I like having a more powerful machine to reduce the lag and having the full apps like photoshop and sketchbook pro. So all that leads me to getting to grips with the inutos. Someone recently told me that it takes 1 week of intensive use to get used to it.