I have 3 different ones all within a 20 minute drive. There both good and bad. The latest one to open closest to me is really convenient but also is pretty empty of customers most of the time, I seriously don't know how it will survive.
This is what I mostly buy from TSC
Tractor pins

Mower deck and engine belts
Towing parts/drawbars/balls/controllers
Tingley rubber overshoes
Schmidt work gloves with the reinforced finger tips
And like it was pointed out the bulk loose hardware bolts/nuts beats buying it anywhere else.
Decent inventory of lightweight landscape trailers at all the stores near me too.
I am after my boss to get one of their countyline tillers to replace the old sundowner we have beat to death. TBN reviews on those seem pretty positive. I have to stop today to buy bailer twine so I will look at them. The had one 6 footer in stock.
I don't rave about the store too much, it is a select inventory that doesn't really change. Pretty much once you know what they got you know what they got, but there are many nice and helpful people that work in them in our area. Much better than big box store employees.
The inner city one by the main greenhouse is always frequented by suburbanites slugging around buying bird feeders and seed all the time!