I picked up a GTI 2000 and, having had 2 GTI 1500's, find that it's no different in disc. mode (which is as it should be) and has an awesome AM mode. I'm not too sure if the 2500 is all that much better, save that it has a backlight. The coil problem is not present on mine since the previous owner returned it to the factory for a "tuneup" and they replaced the coil gratis. If you read through the manual for the GTI 2000 & then compare it to the 2500, you'll notice that a number of "features" that were ballyhooed on the 2500 (with the requisite stickers eg. scantrack) were present on the 2000 but only got a quick mention in the manual. Detector manufacturors are no different than any other business and often reinvent preexisting functions as something "new & improved".. ever hear of "antibacterial" soap; kinda like saying "wet" water. One thing to find is related to the ground tracking. The 2000 has 3 ground tracking speeds (and off) and, reading through the 2500 manual, it doesn't mention any choice of speed.. only on/off. I'd say that, if you can get the 2000 for a decent price, go for it. The possible improvement that the 2500 offers probably isn't all that great. ...Willy. BTW. You might notice that, despite the bad press that Garrett detectors get , there are relatively few used ones for sale as compared to Minelab, Tesoro, Whites... Hmmm, wonder why?