I had a short period with the Mk 1 version a couple of years back (rather more primitive looking but electronically the same I believe) and on that basis recommended the machine to Doug in Manila who was looking for a hoard hunter at the time. Unfortunately it just could not cope with the mineralisation in his area.
So no go for the beach and high mineralisation areas but excellent for low/medium.
Changes may have been made as the machine has been mechanically improved but like the Saxon Ultra Depth, ground condition should be the first consideration. Perhaps Gary or Shedman could come in and comment.