I had one and liked it. I just recently bought a Nurtural
brand No-Bit bridle
and like it as well. Very well made and a tad cheaper than Dr Cook's.
I like the cross under style. It seems you have good control without the severity of shanks. Most horses I have ridden in it have gone very well. There is a learning curve, but most horses that are snaffle trained pick it up quickly and respond well.
I use mine for trail riding and when friends come over and want to ride. My mare's mouth is very sensitive with her bits, and I want to keep it that way, lol. We have a variety of bits we use for training and show.