Mike, First let me say that I am glad that you like the machines. The lag time that you are experiencing, IMHO, is not normal.. I suspect a dirty switch... What kind of reaction time do you get when you push the trigger forward... The DFX is instant with no lag time whatsoever. While the XLT is an excellent machine with a lot of diehards out there, in the right hands, the DFX can be a killer machine. Default performance on both machines are similiar but the DFX starts to shine a little brighter, when proper tweaking is done... I would suggest the book, Digging Deeper with the DFX by Jeff Foster (I got em) This is a must read if your considering a DFX but great reading even if you don't have one....Jeff knows the DFX inside and out and with some help from some of the fellas on the DFX forum too, you'll be ready to go...One word of caution, a lot of DFX's show up on Ebay for sale, the reason being is that most dont take the time to learn the machine....I have been using them off and on since they came out, and still am asking questions....time to learn the machine, is a factor and admission of a learning curve is another. Sorry to ramble, best to you and God Bless, RichardnTn Backwoods Detector Sales