I own a Whites's Blue and Gray (sold) , a Bounty Hunter Landstar, Tesoro Golden Umax, and Garrett AT Pro, instead of comparisons I like to see how a machine preforms for the needs I have for a detector, each one I have or had preformed exactly like the manufacturer said it would, found good stuff with all, so trying to tell you how long one will last is trying to predict how much rain we will get this year, if one is taken care of they are all made to last.. What your probable trying to say is "am I going to get my monies worth" because 5 to 6 big one's is a lot of money to most of us.. Will you enjoy your Garrett,, that all depends on you,, you'll get out of it,, what you put in,, if your not willing to learn it's language, it don't matter what detector you buy,, you'll not be satisfied,, to me detecting is as much about being outside and the excitement of what might be under the next good signal no matter what detector I carry out,, each one is like owning a pet, no 2 dogs, horses etc are alike.. I've seen guys on the tube put the AT in deep water and carry it on land and it still hunt and find good treasures,, not trying to sell you on the AT, but I grant you it will stand it's ground with all the others in it's price range,, but the others are still just as good and will find just as much,, some warranties are better,, like my Tesoro can not beat the life time warranty,, but it's a fair weather detector, so you'll just have to decide if that's good or bad for you... What ever you decide,, it will be right for you... just have fun...

And by the way Welcome to the forum,, many many good detectorist here believe me you'll learn a lot here,, nothing like good information..