we have a topcon base and rover, 30k for the set up. huge time saver for us, i lay out to dig, check while digging, then pin for the foundation crew to set footings. our sites are difficult to layout, some would take 2 guys half a day to layout. we also do all our own topo for our in house designers, land development without having to have surveyer stake anything, build accurate asbuilts, etc. i would never go back to the old way