Don' t know if I've mentioned this before but I was shocked and pleasantly surprised to find this out. As most already know, parks and similar places are now installing electronic devices that wreak havoc because of emi issues. Such was the case in a particular section of my favorite park. EVERY detector I owned (bounty hunter, whites, Tesoro- a including the normally stable Royal Sabre/5" coil) was almost unusable if not annoying. Enter the Ace 250/sniper combo. Not only stable at normal sensitivity but MAX! I don't know if it's the coil or internal frequency or what of the Ace. I'm fairly sure it's the coil as I had emi problems at another location before switching for good to the sniper. Any other users notice this? Thanks.