Welcome to the forum 19.3. This time last year I was still using a Eureka Gold. It took some time to find my first bit (over four years I think) and I really had to work hard to learn to use this detector in tough mineralised ground. But eventually I began to enjoy some regular successes and found over one hundred small bits in nine months, detecting, going out around about once a week. I have now expanded my range of detecting tools to include an SDC 2300 and it is also finding small bits (about 60) since I started using the SDC last October. I have kept the Eureka and I have used it a few times because it is still a very useful piece of equipment. It can discriminate targets which is handy around some junky reef areas, also it is really good at picking up small specimens that the SDC cannot detect. Even though it is old technology it is still probably one of the better vlf detectors for finding gold. At the very top of the page there is a magnifying glass symbol. This is a search button. If you click on this button and type in 'Eureka Gold by Au Fever' it will take you to a very informative set of posts all about the Eureka Gold. Rather than upgrade you may wish to expand your detecting arsenal.
Cheers Bob.