Hello; I own three tuners. The Ten-Tec 138B, The Palstar AT1500CV, and a Dentron 160-10AT.
Out of all three The Ten-Tec 138B performs the best. The TT 138B matches my antennas the best giving me the lowest SWR. on 160-10 meters
I find all three tuners easy to use but the TT 138B does the best job
Hope this helps,
Chris K4OSK