No personal experience from there. But I did go Turkey-Iran-Pakistan-India some years ago. For me, Afghanistan seemed too dangerous at that time, and it does not appear, that a whole lot has changed since. We have a peacekeeping force of about 200 men working there, and there were reports of attacks against them using roadside bombs just a few days ago, not the first, and not the last time they have such incidents. Those guys are soldiers, so of course it is a bit different.
But there surely won´t be too many tourists around, so you´ll probably stick out everywhere like a sore thumb. And for me, the risk of kidnapping alone would be high enough, that it´s a reason to stay away. I would not want to leave my loved ones in a situation like that.
As almost always, there probably are some areas in the country, that are in fact much safer than others, so if you insist on going, then spend a lot of time trying to learn the real situation, and also following it closely, even more so, when the time of your trip gets closer, as situations change. I believe there have been a few posters at the HUBB, who have visited the country within the last 2-3 years (ok, I see the link to the thread is already here!)
I know people are willing to take different levels of risk.... and I´m sure it is a very interesting place, but for me, it still seems too risky. (Just my 0.02 of course.)