This sounds about right. I purchased mine from Spruce. I found that I had to spend most of my time watching the unit for targets. I called the mfg and they said that they will be shipping them with access to warning tones. I asked if I could exchange mine for the improved one? He said they would upgrade my unit for $100.00.........
It went back to Spruce the next day.
As with any electronics, don't purchase them till you really, really, really need them. They just keep getting better.