I was surprised to see all the negative reviews?! If you want a professional editing app with bells and whistles, spend the money and buy one. This is simple, straightforward, and really easy to use! Actually, it's as simple as cropping a picture in your photo gallery. And, unlike some other apps like it, they don't add watermarks and make you pay to remove them.
I have downloaded all the apps from this developer. Crop app, edit/cut/trim app, compressor app, and the special effects app. They're all great and all free. For every, sometimes every other, video you edit, you may have to X out of 1 ad before you start and occasionally, there is one that you have to wait an entire 5 seconds before you're able to close it. And maybe there's an barely noticeable, small bottom ad banner, but it's so unobtrusive that I can't even remember or say for sure if there is one or if there's one there all the time. Personally, closing one ad is perfectly reasonable and not a big deal... considering you have to do that for many paid apps too.