There were five releases of SHS TO's with marked improvement each time. The latter the production the better. Don and Robin were saints about allow you to send in earlier ones to be upgraded or replaced with newer ones for N/C. I sent all of mine 3-4 times as a batch until they were updated to the latest/last release. I very much liked their S-Trax system. Sold all of my SHS TO's already (all were of the "D" series). Now have two MTH units left. Go to this NASG web page site for a chronological description of SHS TO's (thanks to Don T. once again).
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