I was so astonished with the feedback from CSers on this lens and got it eventually, for an indoor event shooting. Just to share my experience with this lens..
First off, I found that 50mm is a little bit too long for indoor even shooting (esp. if you're having event in HDB in Singapore) So, have that 50mm length in mind =)
Then, I tried using it during my friend's wedding lunch. Again, 50mm is a little bit too long for group shooting (the most you can go is 2~3 person in a pic), otherwise you may need a shorter focal length..
While this is a good and cheap lens with F/1.8, it is not so suitable for indoor event shooting with limited space. However, no doubt it is a good portrait lens!
Just my two cents, hope it helps =)
Cheers!