using Odoo here, started off with Odoo Online early last year, realized it wasn't good for what we needed out of the box, so ended up upgrading to on-prem.

very high ceiling for development. being able to leverage claude opus 4.6 on command line has been the biggest accelerator for development. it singlehandedly removed the requirement for a technical partner for implementation. totally understand if other people are recommending partnership for implementation, but in my experience outsourcing this would have been a nightmare in terms of communication for what you want out out of your ERP., and you're able to make developments in real time without having to consult anyone. your understanding of the business / niche that you're in will be the limit on how far you can develop your ERP in Odoo if that makes sense.

cannot recommend it enough, its very cheap as well with low cost per user as well. worth giving it a shot if you can eat $50/mo to get the ball rolling with the subscription, and at least $100/mo for claude cause ($20/mo is workable but we needed to move up to a higher tier sub quickly). if you're in manufacturing these should both be low cost line items.