A proper and satisfying ending, imo. And there's a really cool wrap up gag they do that loops it all back to the first episode. Definitely worth the watch, but take breaks. Do a season at a time or something.

Yes, a very satisfying and enjoyable ending.

Also, don't forget The Fall Of Sam Axe. It's a movie they made that tells the backstory of what happened to Sam. Watch that after season 4 of Burn Notice.