I always seek out bagels wherever I am. They are one of my top 5 fave bread products, and I would…read morelike to think I am a reliable source. (I've had bagels from Fairmount Bagel and St-Viateur Bagel in MTL, as well as NY Bagel and Bialy in Chicago...And I hate Panera's bagels, for you state-siders, just so you know where I stand).
This place is really popular at the lunch hour with Parisian lycéens, and there is usually a line. The workers will ask you for your bread of choice while you are still in line, so be ready! They have nature, pavot, oignon, fromage, sesame...and probably a couple of others that I can't remember off-hand.
They offer a list of bagel sandwiches that are named, of course, after North American cities. All of which have little or nothing to do with the cities themselves. The "Chicago" has tuna on it, for example. (??)
But among the ingredients are avocados, cream cheese, tomatos, smoked turkey, salmon, roast beef, mustard (American yellow and a l'ancienne)...etc. They have some really tasty combos to choose from, and also offer a formule at lunchtime: sandwich, drink, dessert/chips (depends on the day...) for somewhere between 6-9 euros.
To sum it up: Legit, good bagels, good toppings, and they will toast 'em for you!