I haven't, but on a trip to H&L I asked the cashier what they sold there in the restaurant area. She said they only sold whole roast ducks to go. This contradicted my perception of the place and the sign you are seeing now in the window. Admittedly, there may have been translation problems in my conversation with the cashier, who spoke with a heavy Eastern European accent.
BTW, they sell frozen durian fruit at H&L out of a big freezer in the seafood (!) section. I can't help but think that the location of the freezer is telling. I wasn't brave enough to buy one.