I like this addition. Will have to try it out. Trello is friendlier than Pivotal, which is where I come from. So having this enhancement can aid in a few measures.
Yes, give it a try! We manage all our projects with Trello and this extension really makes it easier. I like the better display of the estimations but what really helps is the sum of a list or the global count for the board.
favics
Scrum for Trello