Unfortunately, I had to write an update about this store. Sales services went downhill for the past 2 years. I don't know what happened but not the same experience at all as it use to be some years ago. I was in sales earlier in my career and I would have fired right away the guy who was in the soundcard department today. In sales, you have to value your customer and look sympathetic with them... if it is not in your nature to be like that, at least do it for the money they would spend coming back to you.
I went twice in the past year and met 3 sales rep. 2 of those 3 were condescendent and borderline aggressive. I asked a total of 3 small informative questions and I kinda assume that when you spent as much money as I do I deserve a respectful answer. The other one was quite nice I must admit which is why I bought the item I wanted. I bought the rest somewhere else.
My advice : You have the right to ask questions and be treated respectfully as a customer. If the salesman is not respectful and arrogant, please go somewhere else. Italemelodie is a great alternative and it is just a couple of streets up (Jean-Talon).