The gelato here is out of this world! I can't say much about the chocolates themselves; they're highly priced and something I haven't had cause to buy. But we always come here for gelato when we're on Saint-Denis--whether it is July or January. I think the chocolate-based flavors are better than the others, but I don't think I've ever had gelato here that I didn't like.
Recommended--if you can find the place. Suite 88 is one of those little shops that is never exactly where I thought it was, and I end up wandering up and down Saint-Denis, laboring to find the correct cross-street!