I do wonder what is up at White's Electronics. They have not put out a new detector platform since the V3i in 2009. Just rehashes of the MXT mostly. Yet they have been extremely busy on the research front, with the patent issued on half sine technology earlier this year http://www.detectorprospector.com/forum/topic/118-half-sine-metal-detector-technology-hybrid-induction-balance-pulse-induction-metal-detector/ And now a new patent for a constant current metal detector: http://www.google.com/