It's free and a decent replacement for Illustrator if you know how to use it right away. Knowing how to use the program is ideal as well, but there's plenty of other tools in existence to help you with this too, so it's accessible in it''s own right. It's capable, acceptable for a free program, and gets the job done in an appropriate and/or proportionate amount f time.
Lack of 'tips'. In order to use this program efficiently, you need to watch 10+ tutorials just to understand basic button uses. The tools themselves are not clear on use, even with descriptions and emblems that are supposed to be representing use. Working in the artboard space is limiting and the graphs/bars where the tools are housed aren't easily movable. Having a cluttered work-space seems to be a never ending issue.
Watch tutorials on how to use it before you use it. Using the tools through trial and error doesn't really work. Once you learn this program, it's worth more than its weight.
Typeface and letterform were a hassle to use in minor programs. Inkscape has a wonderful amount of tools with different effects, lighting and warping techniques, and area selections. It's an acceptable equivalent to Illustrator and better than any of the other options compared with Illustrator. A good way to explain it is if you're looking at a scale of one to 10, 10 being Illustrator and anything 'free' under 5, Gimp is a 5 and despite also being free, Inkspace is a 6.5 due to the capabilities of the program.