iDempiere

Pros: Open source, fully featured, no-nonsense approach. I like the interface, but it took a while to get used to after coming from WebERP.

Cons: Learning curve is a bit steep, but not a major problem. It's probably not ideal for people without tech skills. The linux port is awesome. Haven't tried the Windows port because ... why bother ;-)

Overall: Just a good software package at the right price (zero). Works well. Another user complained about it being slow off the cloud. We've seen no problems with speed but we're running on a local server. Can still use remotely, which is nice. Maybe that other user has a cloud issue.

Pros: User interface with beautiful graphics, use with the browser makes the database accessible on the server or in the cloud from anywhere in the world. The software is very complete, adaptable to any type of business, with almost infinite possibilities of customization*

Cons: The system, despite very fast computers and fast internet connections, is slow (used with cloud), with a clear increase in company costs.
You need daily assistance for any use, after more than three years it shouldn't be. In a company, after six months, the ERP should facilitate business management, not slow it down.
* Each customization involves serious system slowdown problems and at each version update the customizations may no longer be supported.

Overall: Probably this ERP is recommended for a medium or large company, possibly with a technician - it engineer within the company for its continuous development and customization.
in a small company like ours, it is not a valid solution because the few human resources are engaged by software problems with a disproportionate increase in costs.