After using Tapatalk for about 6 months now, here's what I see as a handful of benefits. I really like it.
1) I have all of my forums stored in it. With just a simple click I can pull up any forum I want.
2) When you click on a thread, it automatically loads to the last post you read. This makes it really easy to continue reading where you left off in a thread. Normally, on my computer or when I use the internet on my Galaxy S4, if you click on a thread you load to the very beginning OR to the very end if you click on that option. Either way, you have to scroll to find where you left off. Tapatalk removes that annoyance. If there are 100 posts in a thread and I have read 50 of them, when I exit that thread it remembers that I stopped at post #50. When I go back into the thread, even weeks later, it resumes at post #50. That's awesome.
3) Posting pics is super easy. Literally you can snap a pic, click "share" in the camera menu, and Tapatalk appears as an option. Or you can be within a thread, click to post a pic, and your camera gallery appears as a source. There is no more having to upload the pic to Photobucket, clicking on the image address, and going back to the thread and cutting and pasting to post your pic.
I'm sure there are many other benefits, but for a novice user such as myself, these 3 make it awesome. I have not loaded a single forum page from my phone the old fashioned way after using Tapatalk. Granted, a forum page on Tapatalk looks completely different than it does on the computer or when using an internet window on my S4, but I don't care. Tapatalk makes the whole user experience much more efficient and simplified. Again, I can't stress enough how easy it is to post pics from within Tapatalk.