An open-relationship

Ok, I want some opinions on this. What are your views on it? Open relationship is defined as a relationship in which both partners are free to explore (as in, to meet other people), but within certain boundaries and limits. Do you guys tend to take an open-relationship less serious than a regular relationship? Or do you just think that there can be less drawbacks to it? Alsp, have you ever been in an open-relationship vs a regular relationship? Discuss.