Its good tbh.

The original tumblr app is so dull to use when it comes to picture viewer, especially with gifs that take a while to load.
With this app its faster to look at someones blog because you can see multiple pictures at once.
On the down side, you cant see any videos or text post. To make this app better that would be a great addition. Also just something that I like, a option to make the background dark, or just a different color would be nice.

BronzeKneeCaps about imgTumble for Tumblr, v2.3.4