Excellent Instrument for learning and testing HI, Just a few basic thoughts from a mainly a hobbyist perspective. I purchased this as my interest extended into the 2.4g wireless as well as my main Ham radio interests. As somewhat a beginner I was after a tool that could test everything for me but also help me learn. So far, 6 months, it has been excellent in both respects. The screen is great and being touch is such a bonus. Stability and accuracy are excellent and not that different even after attaching an external GPSDO. The tracking generator is a must and very useful as a signal generator /reference as well. SWR measurement and Smith Charts are so great on the big screen. Being able to "see" what the signals are doing is such a wonderful learning experience. As a maker and ham radio operator Im sure I will get many years of both using and learning out of the excellent device. Allan Meredith , Mudgee, NSW, Australia