Ditto on that.
I got back into the hobby early last year with a used GTI 2500. We had fun together and found alot of clad, but not much else. I sold it and moved up to a used V3+i (upgraded V3) and I have not looked back except to reminise. I counted up at the end of the year (2011) and in 9 months I had $89.20 in clad, $13.71 in keepers (old, silver, and odd coins), and 7 rings (6 silver no gold). Not to mention an assortment of bullets and shells, sprinkler parts, and other metal objects. Looking at the bounty I can say half the year I used the 2500 and the balance was with the V3i
And here is the interesting part. I did NOT hunt any new locations at all with the V3i that I had not already hunted with the 2500. And I can honestly say the GTI 2500 did not find any more than $30 of the clad, a few of the keepers and 1 sliver ring it called a silver quarter as I recall. So lets say $30 in clad, some old coins, and 1 silver ring to be fair for the 2500 and the rest was all the V3i. That is impressive considering it was the same time with each and the vast majority of what I found was surely in the ground multiple years (judging by the difficulty I had cleaning it up at home) and the 2500 got the first crack at all of it!!! I have no doubt that I have been much more productive with the V3i than I was with the GTI 2500 and I am not saying the GTI was bad at all. Only that it was a clad monster and little else in my ever so humble opinion. I like Garretts and I just got my wife a Ace 250. I cannot speak to their service because I never had to use it. My used GTI 2500 was a quite old "talker" but it still worked well which is impressive. Granted it is a relatively simple machine when compared to the V3i including the wireless phones. And I did have some issues with my stock 10" coil and my wireless headphones on the V3i that Whites handled right away on the first call, I had the replacements in days including free shipment, and I was not even the original purchaser!! That is very impressive service indeed.
So all in all I would say you are moving from a sophomore machine in the GTI 2500. I would not say it is a freshman machine like a Ace 250 or other beginner detectors, but you are definitely moving to a graduate level with a detector like the V3i. It will work out of the box just fine for you, and as you learn it will get even better. Best part is your trash finds are about to take a dramatic drop so enjoy it!!
The Shark