Like other deviants, after ComiPo! I've tried also Kuma Kuma, another program that allows you to create manga using ready made templates.
I can basically confirm the judgment of those who tried it before me: ComiPo! is better, surely more expensive, but it offers a wider range of options.
Just to make a quick comparison: Kuma Kuma gives you less characters, less hairstyles, less clothes, less backgrounds (and they do not match each other as those of ComiPo! do), really few 3D items and no chance of uploading more, just one kind of fonts, limited page zoom and last but not least it doesn't allow to work offline (you must be connected). Moreover is quite unstable and it crashes sometime.
The only positive point about Kuma Kuma is that it allows to create custom poses and custom expressions for your charachters. So it can even be better than ComiPo! if you have to create a portrait, a cover or a flier.
Well, there's also another good thing about Kuma Kuma: it has a pack of traditional