I'll admit to finding Significant Other no better than admirably pleasant when this mounting originated at Roundabout's Laura Pels Theatre during the summer of 2015, but there's a noticeably new spark in director Tripp Cullman's production, that neatly glides from effervescent to emotionally raw. If there have been script changes, they don't appear to have been major. Jones is the only new addition to the cast, but perhaps what's happening is a strengthened connection between Mendez's Laura and Glick's Jordan as their relationship moves far beyond the straight woman/gay man dynamic typically found in popular culture. A second act confrontation that has Laura in tears because Jordan feel she's abandoning him by getting married is brutal to watch and you can legitimately ache for both characters.