Criminal Sentence 108: Comma or Em Dash?

From an article about a Jazz club in Paris:

"Shortcomings aside, there’s lots to love about le Duc—not least, the fact that it has already given a new momentum to the city’s jazz scene."

This comma and this em dash are all wrong. An em dash indicates a long break in thought; a comma is a shorter break. When I get to the words "not least," I don't need a break, so no comma needed there. What about the em dash? Do we need a long or a short break? I kinda think short. How about this:

"Shortcomings aside, there’s lots to love about le Duc, not least the fact that it has already given a new momentum to the city’s jazz scene."

I like that better.