I have tested the marketplace solution, the platform is promising, the team has a solid background so hopefully it will improve quickly. I am still thankful to the team who has accepted to extend their offer to marketplaces, few deals do this and I know it's hard to build a marketplace solution (there aren't many on the market), so we have to be patient.

Things I did like:
1) Generous offer: marketplace in higher tiers, unlimited vendors (confirmed by support, but would be nice to make it clear in deal terms) and products, all features are unlocked, no hidden fees.
2) Clean admin UI.
3) Many themes (the team could do better in term of quality and mobile support).
4) Many payment methods, I have tested stripe connect integration and everything was smooth.
5) Headless mode is in the work according to the team (public API).

Things I would like to get improved:

1) Multi language support for stores: more control on email content sent for notification or at least support other languages different than english. It doesn't make sense for users to receive English emails whatever the language settings of the store. I'm not speaking about multi lingual support for stores here (which will be great) but only a clean support for other single languages.
2) More customisation for vendor onboarding steps (some steps don't apply or need customisation in some countries), enterprise types are not translated!
3) Full GDPR support by being transparent where data is hosted, marketplace owners should be transparent with their users regarding this point.
4) Performance of stores could be improved as pages don't load really fast for a test marketplace.
5) Few translation errors and layout issues once the language is different than english (text becomes longer in some languages and breaks the CSS).
6) Improve the reliability of the platform, my first vendor onboarding was sent OTP email confirmation multiple times but never received. I had to retry the next day and it did work.
7) More customisation for subscription plans on the display side (show commissions for example and remove free plan when commission is set).

Last improvement suggestion goes to the community website, the existing solution is not the best to build a solid community. It's not practical and contains many bugs. Maybe you can simply create a Discord server or something more modern to get quick feedback and interact with the community.

Overall, I'm optimistic about the future of this platform and I am placing my trust in the Dokan team, thus I am giving five tacos for the potential even if I have listed many improvement suggestions. Good luck!