When To Go Mananged or Unmanaged Solution in Dynamics CRM

Here are some points that I consider when making decision between Managed and Unmanaged solutions:
Should go managed when:

• You need to uninstall solutions
• You want your solutions on marketplace
• You are shipping repeatable solutions
• You are maintaining integration components

Otherwise, go unmanaged.

And there are some limitation with managed:

• Can't overwrite unmanaged changes
• Less predictability in end result because of solutions layering and existing unmanaged customization
• Solution dependencies
• Can't return to unmanaged state
• Inability to fix small issues easily
• Challenges for deleting components