In the June 2011 issue of POB I did a review of the Carlson GPS.
I enjoyed using the unit and found no difference between the Carlson GPS and my Sokkia GPS. I did not check compatibility between Leica etc but since it just produces numbers and files I can't imagine any problem. There was no problem importing into my CAD drawings.
I use a Lecia TCR 1105 as my usual instrument and Carlson Survey 2008 as my CAD program. I reduce through OPUS fro static work but rarely need to do it.
I'm sure that your dealer would allow a breuif trial run with the equipment so check with them!
Don Poole PLS
Outermost Land Survey, Inc.
"Outstanding in the field"