I bought one for $1.29.
The chicken tender sported a thick shell of batter that managed to stay crispy despite being covered in Buffalo sauce. It's too narrow for the bun, though, and left about a third of the bun's surface without chicken. Your best bet might be to tear the tender in half and place the halves side-by-side for maximum bun coverage.
The Buffalo sauce was well-balanced with the expected spicy and tangy notes met by the salty bite and herb-y creaminess of the Parmesan Peppercorn Ranch.
Nutritional Info - Arby's Buffalo Chicken Slider (106g)
Calories - 290 (from Fat - 120)
Fat - 13g (Saturated Fat - 2g)
Sodium - 860mg
Carbs - 31g (Sugar - 2g)
Protein - 12g