Since i have my choice of two extremes, I see it like this:
If i go to The Beer Nut and dodge the aggressively helpful sales staff and jockey for room on the table to measure out my grains, I don't really trust their mechanical scale when i am trying to measure out 6 ounces of something for a complex recipe, and i wonder how far off my measurements are, and whether i'm snowballing to a higher or lower OG than my target. And then i have to remember whether i selected the Breiss or Weyermann when i get to the cash register. And the only bags they have for grain have the strength of a kleenex tissue.
If i go to Art's Brewing Supplies and have an interesting conversation with Art or his lackey while i select my grains, it may turn out that I have to buy a half pound of chocolate malt or a full pound of cara-pils, but i know i will use them eventually and they will keep for a long time in the freezer. They come in relatively strong bags and if i need some really specific small number of ounces of some specialty malt i have a really good digital scale at home. Art's grain is actually cheaper than the beer nut's grain so it turns out it doesn't cost me any more. I just end up storing a few ounces of various specialty malts in the freezer is all.
The proprietors of The Beer Nut are pretty sure they know everything about brewing beer and they know, well, more than i do, but sure have an attitude about it.
Art probably really does know almost everything there is to know about brewing beer and has a huge attitude about it. But somehow it's more endearing when he talks down to me than when the beer nut staff talks down to me.
I haven't tried to buy grain at Salt City Brew Supply. Their staff are more laid back but know as much or less about brewing than i do and sometimes seem to pretend to know stuff they don't know which is only a little annoying because they are open an hour later than Art is, and a half an hour later than the beer nut.