I just upgraded to cloud to try it. And your description is bang on... It feels like it's mainly a sign software, with a very basic rip thrown in.For vector drawing/editing/node manipulation, Flexi is way easier to me. Illustrator is fine. But for most sign work, Flexi will do everything Illy will do, and like I said, some of it easier. I find Illy's toolbars and menus cumbersome.
Don't think of Flexi as RIP that has an editor...it's not that. It's a sign software with an attached RIP (Production Manager) that flows together. And with the newer version for HP Latex (Profiling and Media Management) it's all in one.
Are you unable to edit the image via production manager? In onyx I can quickly Crop an image. Took me awhile to figure out color replacer...it's a bit crude compared to Onyx's, but it works, so that's good. I wish it updated in real time as I changed stuff though, but beggers can't be choosers!
after playing with it for an hour, the onlything that seems to be missing is the cropping.
I stick by my original statement... All in all, it comes down to a matter of preference. For me, I prefer Onyx. Flexi feels a little too basic / not as customizable. But in the end, both software's can pretty much do everything the other can do, and just as good... it's all about getting used to the different layouts.