Notch has provided me the hands down worst customer experience with any product. And the reason is that they simply won't reply, no matter what. I tried for months in various channels, even finally on LinkedIn, and got nothing but stonewalling.
Their product is absolute garbage, a readymade codebase wrapped into a half baked proposal tool, that does not have ANY version control. That means if you make a mistake in the editing, all your work is permanently gone.
This happened with my company, where due to their editing bug we lost a full workday for a 10K€ project proposal. Even worse, this proposal had been sent as a link (how Notch intends), so the content of the proposal was lost for the prospect as well.
When checking online about the team, it also seems that they are running out of money, and are desperately looking for additional funding. So the team is broke, and that's why there likely won't be any notable feature upgrades.
All in all, I would advice HIGHLY to stay as far away as possible from this product and their team.