It's a bit time consuming, but it felt pretty low-risk. I did it a few weeks ago and didn't have any troubles with it, but admittedly I've got plenty of experience with similar teardowns.
I got the transparent kit and it's pretty nice looking, but admittedly, I wish that I applied a matte finish to it. The glossy plastic feels a bit odd to me - not as nice as the finish on the normal casing. QC seems a bit dodgy going off of reviews, but my kit was fine.