Hey guys, don't have much to say that will help you, but my initial impressions are favorable for the TDI....don't relic hunt, but it seems the machine handles bad ground well enough and can be tweaked via the other controls to suite many hunting environments......my opinion is that you get great bang-for-the-buck with the TDI......you may have heard that the current model TDI is being discontinued; if still around, new ones can be had for $1250.00........a new model will have some sort of improved ground balance mod, and maybe a tweak on the sensitivity side of things....these changes are to cater to our Down Under brothers, because some of their ground is nasty.....price: $1700.00.....hope this helps a bit....Jerry