Every time I see one of these stylus products for an iPad I chuckle. An active digitiser would be a great addition to a future model, but if pen input is important to you, look elsewhere.
Accuracy is not the issue -- the jot pro stylus seems very accurate to me. The real problem is lag, which so far prevents me from doing any handwriting on the tablet.
From what I can tell, lag is an issue for all the tablets right now?