Is the multipage creator any good?
Yes very good. Much software.
Jokes aside, it's not ready for client use. I have a vague roadmap for it, with phase 4 being stable enough to promote this as solution for HISE devs, but we're not there yet.
Phase 1: Use it for the internal HISE dialog windows. This is pretty much complete and the snippet browser is a glorious example of a new UX-friendly future of HISE.
Phase 2: Use it for the HISE installers. It kind of works but I'm still breaking those as I work on the multipage creator core architecture. I aim for the HISE 4.0.0 installers to be built with this system though.
Phase 3: Use it for my own projects as installer solution. This way I am responsible of fixing backwards compatibility stuff
Phase 4: Make docs & examples for other devs to use this
Phase 5: Integrate this entire system into HiseScript so you can use it to make modal dialogs, use standardized CSS for look and feel etc.
So we're at phase 1.5 at the moment but I decided to put it on hold and resume the work on the glitchfest that is called HISE for the next weeks.