These look interesting...but I’m a huge fan of Posca Paint pens. They never, ever clog or leak. Why do you like these better? How are they for clogging and leaking? The extra set of nibs is really handy. Doesn’t the acrylic paint cover up the stamped lines-guess you just have to color very carefully? Colors look really pretty, too.
I love the POSCA paint pens as well. I like the fine tips to these. I actually like that they are opaque enough to cover up stamp lines at times, but yes, if you don't want it to cover up you'll have to be super careful.