I haven't re-read the whole thing ina while, but I have pretty solid memeoires of the first strip, Summer Magic, being pure ace, while the other longer stories aren't quite to that level. But there are some single episodes here and there that are superb. And yes, the art, from both Ridgway and Parkhouse (the latter especially on 'the Old Striaght Track') that are gorgeous. But I would caution undsure buyers that the story as a whole kind of doesn't finish. I don't know if it was ever meant to, as the whole thing is set up from the off as recollections of a childhood from a now-adult wizard. There are climiactic moments here and there, but I always wanted to know more about what happens to Kirby in the 'normal' world, and was less taken by the wizard-y / devil shanenigans.
Still, Summer Magic on its own is must-have 2000AD!