Don't look any further for a pen for your iPad; this is by far the best for your money. I have no problems with it whatsoever, it works with every app I use, whether for selection, keyboard, game play or drawing. Out of interest, it also works well on my Nokia E7 phone.
The tip blends smoothly with the metal collar, so there are no sharp edges to scratch your screen.
My only slight gripe is that the 'peg' for attaching the lanyard to the iPad headphone socket is extremely tight, and I'm concerned that frequent use might "stretch" the contacts inside and so affect the quality of headphone/speaker connection. This is no deal breaker though, since I'd rather keep the pen in my pocket.
Don't be tempted by more expensive pens, such as the MediaDevil Magicwand capacitive touch screen stylus (Matte Black edition) for Apple iPad / iPad 2 / iPad 3 / iPhone 4 / iPhone 4S / iPhone 3G / iPhone 3GS / Amazon Kindle Fire / Samsung Galaxy Tab / HP TouchPad / Motorola Xoom / BlackBerry PlayBook / Sa...
. You are buying the exact same item with a different name on it. Even the box is the same with a different design on it. I have one, I know; I was gullible enough to think more expensive was better quality when I already owned a good product!
I thoroughly recommend the Acase Capacitive Stylus Pen - it's the best one I've used so far. No need to look any further, go for this one.
UPDATE: I have now been using this for 6 months and it's still as good as the day I bought it. An excellent buy.