The Deus I is a better sound machine and a better single frequency machine than the Deus II. Full tone on the Deus II sounds bad and its not true that the Deus II has an 100% imitation of the Deus I sound, its not a deus I sound at all. If you test Deus I vs Deus II with a custom made program called Sonar and use 11" coil on both the machines (X35 coil on Deus I) then the deus I will hit the coins better and deeper. For people with hearing issues, the Deus II has som flaws regarding the sound, for me its a problem with hearing the midrange tones because some how the treble overrides the midtones. I think XP detectors will get an update in the future that will fix this issue, but for now its not a priority for me to buy a Deus II and not be able to use the machine. I had the XP deus II for 3-4 weeks and did tests with it vs Deus I, Nokta Makro Legend and sadly the Deus II did not do as well as I had hoped in my field tests.