Hi Rich , well one of the reasons was that I wanted to see how the detector would do in the trashy parks I hunt . The 81/2 coil is just too big . This coil should help pick thru the trash . But the other reason and main reason is because finding coils for this detector are getting hard to find . I happened on this one , the last one and I had to buy it to compliment the other two . Not that I used this detector very much since I have faster and lighter detectors for trashy sites . That’s also the same with my rainbow xlt . It’s super clean and minimal use. The only dd coil they make for the xlt is the 4x6 that I know of . Been looking for a 6x9 for the xlt but hard to find . I saw one on eBay , cors , but they are selling for $295 . That’s crazy ! I saw a Mars coil for it 6x9 selling for $140 .00 but unfortunately they where out and didn’t know if and when they would get anymore . Anyways these detectors are more like den decorations lol . I have other detectors for today’s modern hunts with more trash and less goodies that I used more.