Ya, they don't seem to be nearly as smooth as older $700+ Wacom tablets I've used have been, but really for a $70 tablet that should be expected.
What really seems to bug me is how much latency it seems to have. This could be a problem with Photoshop though as the version I'm using now does seem to be a little choppier than the much older version I was using before. And if it's a "problem" with Photoshop than it's really probably a problem with my system being a bit older as Photoshop is usually optimized fairly well.
Oh, and the other thing I noticed, which I didn't like, was that my 16x9 aspect ratio monitor seems to be different than the aspect ration of the tablet. So what this means is when I draw a line vertically it seems to move the cursor fairly slowly, but when I start drawing horizontally the same movement on the tablet seems to move the cursor much faster on the screen. It makes it fairly hard to draw/write text because of this.