I have two, one on each arm covering the full length of my inner forearms. Took me ages to finally get them done, I am absolutely scared of needles but it's nothing like an injection!!
I found it really relaxing, I was under the needle for 3 hours and at one point I swear I nodded off asleep, which is odd as I don't care what anyone says, they do hurt!! It's not a terrible pain but someone is essentially scratching your arm repeatedly, it's really not too much discomfort for something that's with you for the rest of your life, the healing is much worse!!

I had both my forearms done in the same sitting which on reflection wasn't wise, you don't realise how much you use your arms untill they are sore!!
Really want some more done, I like the full sleeve look but I'm in no hurry, only want stuff on there that i really want, the amount of teenagers I see nowadays with fully tatted up sleeves, hands and necks is worrying, I have nothing against tattoos but covering yourself when you're still a kid doesn't seem a good idea, I don't care what people may say, people will judge you differently, it's wrong but it's true, plus if I'd had the ideas I had as a teenager done when I was young I'd probably regret them now!!
I have a couple of peices I'd like to get done in the near future, one with reference to my girlfriend of 11 years as we are getting married next year, and another peice in memory of my best friend who took his own life nearly 9 years ago, every day we are getting futher apart so I'd like something close by as one day the memories may not be as bright as they are now.