Lyons was my first introduction to natural horsemanship. Many of his techniques were real lifesavers for me, literally. Other things did not work for me at all.
There are several of the techniques that he has completely reversed his position on, In his early videos he recommended that everyone should be able to ride bridleless with spur cues as the main communication, later videos recommended using absolutely no leg or seat cues, that all
communication with your horse was only with the reins, when I tried this approach I found the horses I rode got very heavy on the bit and began ignoring the reins because they were confused by my hands in their mouth all the time. Suffice it to say I got myself in trouble may times trying several Lyons technique(probably mostly errors on my part) and a few of them I found made my horse dull and/or angry.
Even though I'm not a big fan of John Lyons anymore (I think his son Josh has surpassed him) there are still things I learned from his program. I still devotedly live by his three prime training doctrines:
1.Human safety comes FIRST!
2.The horse should never be hurt.
3.The horse must be calmer/more focused at the end of the lesson than when you started.