Still have my first, a Bounty Hunter tracker Iv, not sure when i bought it but id guess about 15 yrs ago, used it quite happily on my farm for years, also had an old Viking but i loaned it out and never seen it again.
I've had at least 8+ models in since then.
I've gotten to the stage that I don't care what make or model i swing, my detecting time is limited as i've a young family, so i'm always on the lookout for what works best for my type of hunting grounds.