Like any thrift store, selection varies but this location is fairly well organized. Join their VIP club for alerts and discounts. Prices are on par with any Goodwill: typically reasonable, note the tag color and shop on featured days for discounts on the ticketed price.
I've come by a couple of times and consistently had the same issue: service. The employees I've come across are pleasant enough, but the line often snakes to 10+ people and moves at a snail's pace due to the lack of cashiers. I know GW is largely staffed by volunteers, but there are plenty of folks putting away and sorting merchandize. Sometimes the twenty minute wait to buy a $3 copy of Elf on Blu-ray and a couple of dishes is more trouble than it's worth.