Chez Lien Plus is situated in the heart of Montreal Downtown on the intersection of Ste. Catherine and Stanley Streets which are always bustling with office crowds, university students, shoppers, sightseers and tourists alike. It's a BYOB restaurant and there's an SAQ just around the corner on St. Catherine street where you can buy your wine before going to the restaurant.
I'd recommend a reservation since it's a downtown restaurant and there are always groups of people waiting to get in. This restaurant is not pricey for a downtown BYOB but it is expensive in terms of the value and quantity of what they offer. Expect to pay around $25-30 per person for dinner (tips and taxes included). There's no corking fee so that's a good point. There was this absurd law which stated that either you have to finish your wine or leave it at the restaurant or something like that (dafuq???) but I've heard that they have changed it now and now you can leave the restaurant with your uncorked bottle with wine in it (Ha! first world problems)
I ordered some soup as entree and lamb-chops as the main dish. Both were passable. I mean nothing out of this world, not very bad either. Your impression would be that you're paying for eating in a restaurant in downtown and not for the food (it isn't extraordinary but it sure is expensive for what you get and if you factor in the BYOB costs, then actually you end up paying around $45). So why bother unless you've an absolute craving for Vietnamese food?
In all honesty, I won't go back there, not because the service wasn't good or the food was bad (both were ok), but because you don't get value for your money (not even abstract value like the pleasure of eating extraordinarily delicious good food or an excellent decor). Perhaps if you're in a rush or can't find anything else for a quick lunch, going to Chez Lien Plus might be a good idea, otherwise not.