I mainly use the explorer-II with the stock or sunray X-5 stealth coil, and have the sunray probe installed too. My back up machines seem to switch in time, and for the last half year has been the Garrett ACE 250 with stock coil and the 4.5 sniper coil. The 250 is inexpensive, lightweight, very easy to learn and gets nice reviews. I bought the 250 for the wife but she never tried it. So then it became a loaner machine. Well one day I tried it, found it nice to use especially for a quick start and go machine for a quick short hunt, or when the arms and back have had enough of the explorer for the day. No menu for the 250, it's all on the panel for 5 program settings and factory preset ground balance. Now it seems to go along with me and the minelab ex-II, but wait, there's more. Yesterday I bought the Tesoro Cibola. I have only backyard tested it and will be taking it out with me on a hunt in a couple hours. It is only 2.2 lbs and is audio only (no screen). It's also a turn on and go. I have heard and read great things about the Cibola. From my short test, It has a fine cut for discriminate mode, goes deep and the pinpoint is just spot on perfect. I already can tell that I'm going to like the Cibola. Oh, did I say it goes deep, read posts and reviews about it's supertune feature and this little machine may require a digger longer than the standard hand trowel. It's audio only which I have been there during my years of detecting, so I don't mind.
So now it looks like my main machine will be the Explorer, or ACE 250, or the Cibola. And my back up will be the Explorer, or ACE 250, or the Cibola.