Derma Rollers

I hope this hasn't been covered before. If it has I couldn't find it.
Have any of you ladies used a micro needle derma roller at home and if so how did you find it?
I've recently noticed that the skin on my arms and legs has become very crepey. I've done the exfoliating, skin brushing and spent a fortune on body creams with minimal improvement.
Then I started reading about dermo rollers, the reviews are fantastic, though admittedly most people are using them for the face rather than the body.
Anyway, I've done loads of research and have ordered one with different rollers for body and face. Couldn't believe how cheap some of them are so was careful to buy one with the right number of needles, made of titanium and of differing needle length for different areas. Even so, it still cost under a tenner!
I am nervous though and wonder if any of you can reassure me.