Based on advice from Uncle Willy and others, I purchased an ACE 250 as a backup for my GTI 2500. So far I have been surprised at how well this little "yella fella" works. I have a couple of questions: Is it worth while to buy the larger coil or the sniper coil? I know that the sniper is for "trashy" areas, but I don't know how much junk would make it worth while to use the sniper. I also has a situation in a school play ground that has lots of foil, etc., where the detector starting giving constant signals that went up and down the scale. I turned it off, then back on, but that didn't help. After I moved to another area, it stopped giving those returns. Any ideas? 
ACE 250 LOVES trush like pull tabs aluminium paper wires etc....... is amazing how mamy noises it make per second.....anyway ACE 250 is a very fast machnne for coins but also for all caind of rubish.