A you tube video made here in the uk pitted a top machine against an entry level machine in real world conditions,ie,the tester took both machines to a new field and compared each signal he found to see which machine performed better.The entry level machine has a sensitivity and discrim knob and the results add weight to what was said in the two previous posts to this one.Yes,over a thousand targets the high end detector would probably find a few more but the high end detector was over a thousand pounds while the entry level detector was less than 200 and in the mentioned test it didn't find anything the entry level machine couldn't.
You don't need to spend thousands of pounds on a high end detector to get great results.....higher costs don't always mean higher finds rates.