There are so many sketch apps out there and this is one of the good ones. Since it's free, you might save a few dollars if all you want to do is sketch a few drawings here and there.
The animation also looks cool, it's as if you actually open and close a journal while flipping over pages and moving across journals.
I haven't experienced any bugs yet and it's tempting to buy a stylus just to really get into this doodling business.
Verdict: good enough to do to what it's supposed to do.