Here's a little excerpt from a reply I got back from a Minelab dealer when I asked him why in the heck did ML market the SE Pro if they knew that they were going to begin marketing the E-Trac so soon. The SE Pro is an SE with the newer coil....
About the SE, SE pro and E-trac...
when the original SE came out, there were many complaints about the stock coil. Prior to the fairly recent change in how Minelab was run, it was just kind of ignored, figuring people will figure out how to use the machine to the best of their, or the coil's ability.
The plans for the E-Trac included the 11" coil that now comes with the 'Pro, so that coil was in the works and done before the E-TRAC was ready to be released. Meanwhile, as ML USA had a changeover, the new guard was considering the ongoing complaints about the standard SE coil. After it became apparent that the E-TRAC debut was going to be delayed by about 4 months, they decided to change their SE offering, thus creating the SE Pro, with the much better coil. They also offered the coil for sale to SE owners, and many have already taken advantage of that opportunity. It is obvious that, unless you are very label conscious, it would be unnecessary for an original SE owner to buy the new 'Pro.