Interesting, a May post that was last used in June, and now it's getting some attention the last week. The original poster uses an X-Terra 705. Not one of my favorite detectors for the different places I hunt. He wanted more 'depth' in the playgrounds he hunts because they get worked often. Best suggestion is to find new and different places to hunt. However, he was curious about the Nokta / Makro Simplex + and the Minelab Vanquish 540. I have them, like them, and use them so I'll add my comments.
I got my first Simplex + last year in mid-November I find it comfortable and the round 11" DD coil works well in plowed fields or pastureland, and when I hit the wide-open grassy parks. I bought a Vanquish 540 this past spring as soon as they came out. I purchased the Pro Pack and really like the ML-80 wireless headphones, and the 9X12 DD coil is still comfortable and has worked well for me the few times I have used it in wide-open / sparse-target sites where the is little masking. But the 5X8 DD mid-sized coil I keep mounted full-time and it works quite well. I know what some of the benefits are of the Multi-IQ performance, and also know there will be times I can out-perform the V-540 with some of my Single-Frequency detectors. SMF is not fool-proof.
I then purchased a 2nd Simplex + the first of June because I was planning on a smaller-size coil to be introduced. I'm still waiting on a smaller coil, but they did bring out some mid-sized coils so on that main-use Simplex + I keep the 5X9½ DD mounted full-time. I have quite a few detectors, to include three on my 'Special-Use Team', but I always like to travel with 3-to-5 detectors in my vehicle (isn't that what a back seat is for?) that are part of my 'Daily-Use Team' to have on-hand for day-to-day detecting or to be prepared should I luck upon a fresh-site opportunity Part of my 'Daily-Use Team' I travel around with are my Simplex + w/5X9½ DD and Vanquish 540 w/5X8 DD. They both have their strengths and weakness, like all detectors, and I grab whichever make or model I feel will provide me the best performance for the site conditions I plan to take on.
I like my Simplex + for some of the mode options and adjustment features it provides, and I like the audio. I mainly use my N/M 'Green' wireless headphones with it because I also use their Pulse-Dive Pinpointer that also pairs with those headphones. I like that and the performance is really good. The Simplex + and that coil handle the dense iron nail contaminated homesteads, ghost towns and pioneer & military encampment sites better than the Vanquish 540. There I am referring to 'separation' and handling dense iron nail conditions. But when I am working a site with less trash and a likelihood of some mid-depth to deeper coins, the Vanquish 540 is the one to grab between the two. Very impressive performance. I had an Equinox 800 and it didn't really out-hunt the V-540 when I compared it w/6" DD to the V-540 w/5X8 DD.
The best thing anyone can do is try them both out for a reasonable amount of field time and see what they happen to prefer ... or maybe, like me, they'll like both f them.
Monte