Ιts good if you wanna stop for a rest or toilet, but not for shopping.Prices are the same as in shops in town, alcohol is cheaper in Bulgaria.Chocolates too :)
Just avoid it! Everything is overpriced there,the coffee,the food,the Goods !!! As Greek by myself,I buy from Bulgaria my Goods and Coffees in Half Price.Apart to the rude Behaviour and dirtyToilets!