As far as his Spirit Bitless bridle goes–I have 3 varieties of cross-under bitless bridles (Nurtural, Dr. Cook’s bitless, and, gasp, a Spirit bitless bridle.
I had a saddler shorten the reins on my Spirit bridle, and out of the cross-unders it is my favorite. My riding teacher agrees with me about this after using it on her crazy Arab (he got better) while she was doing competitive trail riding.
His Spirit bitless, with the shortened reins, would be the one I reach for first if I decided the horse needed a cross-under. The release of this bitless bridle is so much better than the other cross-unders.
I have also bought and used many other bitless systems. For the record my favorite bitless bridle is the Light Rider bitless bridle (a modified Scawbrig). The release of the hand aids is good with that one. Right now I am doing a “double bridle” using the Light Rider bitless bridle with a Fager leather snaffle (the Adam) until my hands get better from my recent bout with fibromyalgia.
After “discussions” with the lesson horses I ride I went back to bits (I now use a double bridle) because I get much better results even with my hand problems from MS. I will switch back to the bitted double bridle when both me and my riding teacher think I am ready to go back to using a curb bit again.
I just get too bored using a bitless bridle, but the Spirit bitless bridle is my 2nd favorite bitless bridle after the Light Rider. Alan Buck did good work when he developed that bridle except for the reins being WAY too long.
He never agreed with me about the way I ride, Forward Seat, which he thinks is horribly cruel and abusive. Shrug. He surely is not the only one I have gotten such feedback from, and Alan Buck and the other FS nay-sayers never saw me ride a horse. Again, shrug. I listen to the horses I ride and my riding teachers and these horses have no or almost no problems with me riding them FS and my riding teachers like watching me ride their horses humanely.
From the reactions of the horses I ride, with my hands they prefer me using a properly selected bit, thank you very much. Once I got the titanium bits the horses have been HAPPY!