Calling all startup founders: What's your experience with Learning Management Systems?

Hey everyone, I'm currently analyzing Learning Management Systems (LMS) for startups and I'd love to hear your thoughts and experiences with LMSs. Whether you're currently using one or have in the past, I'd love to know what you like and don't like about it. What features do you find most useful? What's missing? Are there any specific challenges you've faced when implementing an LMS? Any feedback would be greatly appreciated as I'm looking to create a system that meets the unique needs of startups. Thank you in advance for your help!