My folks used to give me Jos A Banks as gifts. My experience was that the shirts were cut huge (and differently than a lot of other makers) and tended to fray much sooner than my shirts from Lands End, Brooks Bros, and Polo. I haven't seen a JAB shirt on sale at a low enough price to buy. In this day and age when you can get much better prices on much better quality shirts online, there's no excuse to get a JAB shirt.
The suit and sportcoats they gave me have lasted okay. The shoulder pads are thicker than I'd like. I suppose if you're going to buy store brand at a department store, getting a Jos A Bank suit or sportcoat on a deep sale for about the same price would be okay.
The ties have lasted well, but at the price they charge they're nothing special.