I have been using this for a few years now and I have to say.... it's a pretty good program! If you like pixel art and want to give it a try yourself, Aseprite is a wonderful toolset that makes pixel art a lot easier to create. There are onion layers to help you when animating, a blending tool, layers, etc.

Personally I have used the program to create assets for video games, designs for t-shirts on RedBubble, an intro animatic for a game, and animations just for the fun of it. It's very easy to export frames onto a sprite sheet which makes implementation for games very easy.

So I legitimately believe Aseprite is a great program to get for pixel art considering it's price. I mean $15 is a steal to me considering how much I use it. The only program I think that might be better than Aseprite for pixel art is Pro Motion NG, but that one is a bit more expensive. If you are not entirely sure if you like working with pixel art yet, then Aseprite requires a little less monetary investment.