Good tight fit, does not add a lot of bulk to the 1520. I like the slightly textured back (somewhat like fine sandpaper) which gives it a more secure grip. There is a slight raised section around the back camera lens to provide protection. Although the buttons are covered, I have not had any problems pressing them.
I also have tried the TUDIA Ultra Slim Melody case, which is quite similar to the Amzer Pudding, and can sometimes be found at a lesser cost. The back of the TUDIA has a repeating circle pattern on it which does help with the grip, but I found the Amzer back to be a better grip overall.