I was a Marc's virgin until about a week ago*, when I wandered in to the Warren location to get some 2-to-3 outlet converters. Neither the discount section nor the pharmacy/drug store area had 'em. Oh well. I spoke to a couple of not-so-disgruntled folks who at least attempted to steer me in the right direction.
I was pretty impressed by the vastness, cleanliness, and overall layout/flow of this store. If I want to save some time and money, I may come here to pick up a couple of things when I'm in the same plaza.
*Actually, I take that back. I went to the Marc's in Coventry very briefly about 2 years ago when I needed to get change of a dollar for parking. They wouldn't do it without a purchase, of course, so I bought a 3 Musketeers.