I haven't used it but a friend of mine has. His opinion is yeah good. Basically they more or less made XNA work again using Mono, so if u liked XNA its very similar.
There’s been quite a few games released with MonoGame. It’s a direct port of XNA API to open source. Like I said, I have history with XNA. No one heard of our games but they heard about XNA/Silverlight. The precursor to MonoGame. Shout out to Bill Reiss wherever you are.