...I KNOW that the solid coils are considered Old School today but since I consider myself Old School.............I consider that a good match for me.....I recently acquired a Sidewinder and replaced the donut coil with a solid 8.5 inch coil....I like the solid feel plus feel the depth is the same plus it does Not get hung up in weeds and vines and other what-nots when I am searching in the woods relic/coin hunting.......