I agree to a certain extent about old technology. When I got my first detector I had to go to the Post Office for a "pipe finders licence". Since then, only a handful of manufacturers have stayed in business, not always because their product was poor. There were no real advancements for years, then along came Minelab. Their FBS technology really improved the depth capabilities, albeit at a price which was the slow reactivity. Since the early Minelab days they have only, in my opinion, made subtle improvements. The CTX 3030, was at least waterproof/submersible, and did improve on target i.d. But for me, the game changer was the Deus. I will admit, when it first came out, my thoughts were along the lines of it being a Mickey Mouse machine that wouldn't last 5 minutes. How wrong I was. I purchased my first one in 2011, which was second hand. What an innovation, completely wireless, light, selectable frequencies, and FREE upgrades.
Before anyone says i'm biased, no i'm not. At this moment my machines are, Minelab Explorer 2 & Etrac, Teknetics T2 and a Whites TDI SL. (Yes, I do like to waste MY money
I'm sure it will not be long before another Deus enters my collection (please don't tell the wife).
Happy Hunting all.