Although re-posting what Zigmo wrote, here's my take on it
* Fast 1.8 lens
* Cheap to purchase
* Wife/Party/Friend friendly lens.. hard to stuff any of the shots when drunk
* The autofocus speed without doubt
* Shooting at 1.8 in a burst mode for indoor sports (ie basketball sequences for training) autofocus is not only slow, but struggles sometimes & kicks in and out of focus on subject.
Like said above, definately a worthwhile lens to keep in your kit.. I love it