MicrosoftOne input I can give is that you need the separate power apps license to upgrade your cds environment. I've noticed that M365 E5 is not enough, as the PowerAdmin Center is full of holes without the separate license.
Here is my general feedback after first use. We wanted to use the roadmap feature to visualize our big company wide projects for the next 4 years.
Turns out we can't, as we'd first have to create ALL the projects with ALL the tasks we want to "bubble up" in Project Online first, as we got none of those. Adding rows without a connection an actual project is also useless. It's just a row with a name, not tasks in it.
Also of note, as it wasn't immediately clear to me. You can't change the date of those roadmap tasks, they are linked to the actual task dates from the project. You can only change the status. Also make sure to properly publish your project, otherwise you won't be able to link those tasks in the roadmap.
Basically Roadmap requires a bottom up approach where to have to have everything planned before you can create a roadmap. I'm no project/roadmap expert but I would have expected it to be the other way around, say make a rough roadmap and then start planning everything in detail.
