Having not drawn much at all since high school it has been a nice change to get back into it.
One of the most surprising things has been the response to my choice of tools.
I use Biro / Ballpoint pen, mostly because it is cheap an easy to come by but also because it is what i always remember using to sketch away in books back in the day. It wasn't until i mentioned it to a friend that studies fine art that the horrified look of response surprised me.
I enjoy the unpredictability of it and the scratchiness. I encourage you to give it a go too.