Yep, good point f2D, but there is an operational limit you bump against based on your choice of machine, that is a fact. Used my BH days to the strengths of the machine I had. When I knew I wanted to get deeper, it wasn't just a matter of the proverbial "bells and whistles" it was the real increase in depth that comes from the high end equipment.
When I got my first CZ5 very shortly after they hit the market it was a major change in ability. I've stuck with the CZ series since then as there has been no effective change in signalling characteristics among MD mfrs since the CZ lines came out and the other high end machines all have similar depth capabilities.
I've hunted with a lot of other folks and so far have been most impressed with the White's high end line. Not enough to switch brands, I am working my machine to it's limits and am satisfied with the results. But at the end of the day most of us use the big dollar machines becasue we find ourselves at sites where even for the shallow targets, these machines are better in either target separation, identification or locating that elusive find.
That said let me add, no brand wars fellas! (sounding kinda like an invite to some of you)