Two persons in my club (wf4.nl) including myself have bought a Deus. We have had quite a bit of success with it, and do like it very much. We first tested it in England last fall, were there for two weeks, 9 to 5 every day searching, never had any problems. With more than one Deus you do have to change the frequencies or you will bother a other searcher.
Its not only lightweight, but folds up to a small package; when I search here in Holland I put it in my backpack when I go on my bike to search, then my shovel is the longest thing.
Being lightweight, and wireless its easy to use, it was a funny coincidence that BOTH the other member and myself had damaged our right arms (he with a tennis arm, I fell hard on mine while searching in a hard clay ditch) and needed something light and easy to use. We normally have for a number of years used our XP GMP, which is our standard search machine for years now. With the GMP we both wear the unit on our belt, so its not so heavy and does not wear you out having only the coil and stem in your hand. But the wires do get in the way sometimes, especially when your are digging a find on the side of a hill.
Since we search EVERY day from 9 to 5 (or later if we have a hot spot) and that for two weeks (sometimes 3 weeks) our arms could fall off if we are not careful, we are not young guys anymore.
For all of those problems (weight, arms, wires) the Deus was our machine. We even made a wire loop system for our shovels, because carrying it in our right arms was tiring and sore at times. The wire look we attached to our belts, and with another wire loop on the shovel it just stayed on the belt and funny enough was not even in the way, until we had to use it.
Anyway, that's about using it. Compared to our GMP the Deus performed just as good, if not better. The discrimination is very good, the sounds also from the headphones are clear an sharp. I have searched so long with a detector without a meter because I just have used my ears to find fantastic finds over the years, I think its about 15 years ago when I trading in my Whites XP for a Lobo, which I had three of and used all the time, great machine. Now with the good discrimination from the Deus, and the meter on the remote unit I missed much trash.
About the depth, I can not say much, I think its about the same as the GMP, which is pretty good. Deeper than the Lobo in any case. I do like the Deus, have even thought about trading in my GMP for another (as a reserve machine, which I always have with me), did not have to pay much extra then, but still did not do that. Reason being is my GMP with its huge coils, that works just fine for deep objects. Will use that again after searching a field with the Deus, finding nice stuff, and then later with my big coil on the GMP to see what I have missed in depth.
Well if you have more questions, let me know.