I've played around with IdeaNote for a few hours and here's what I can say.
PROS
1. It's a cool idea.
2. I can see it being quite helpful if you have a similar process to the one intended.
CONS:
1. It's buggy. I had a column view bug out and become unresponsive with an 'unknown error' happening in the bottom bar.
2. I also made an automation to move an idea from one collection to another based on likes but immediately hit 2 snags: a) when the idea gets copied across to the collection, it actually appears in EVERY phase instead of in the inbox phase as intended. b) even linking a COMMENT in the idea sends it to the other collection. (hmmmm... surely this can't be desired behaviour!?)
3. It seems to be impossible to allow people to choose what phase their ideas go in without giving them edit access (which allows them to do all kind of things they shouldn't do). This is a HUGE oversight and probably a dealbreaker for me unless I can figure out a workaround.
4. Some really obvious things like having a single column (phase) be uneditable by viewers seems to be not actually possible -they can still comment by the look of it. Also when you move idea cards to other phases they seem to somehow pick up multiple actions (even duplicated ones!) - this is truly annoying and confusing from a UI perspective. Other things liek being able to edit the text of the 'add' idea button which just says 'add' would be nice - kind of surprising this functionality isn't there.
Overall I would say it's promising but actually quite inflexible as a tool which I find really frustrating :(