The Henseley sounds decent enough. I simply have never heard of it. I've been on trailering websites for many years, and never heard it recommended, or discussed until this thread.
Love my Tekonsha Prodigy. Same unit since 2003 on 3 different tow vehicles. They have a good reputation. If mine ever dies, I would go for the P2 or P3.
thebrakeman ('70), DW ('71), DD ('99), DD ('01), DD ('05)
2004 Surveyor SV261T (UltraLite Bunkhouse Hybrid)
2006 Mercury Mountaineer V8 AWD Premier
Equal-i-zer WDH (10k), Prodigy Brake Controller