I have the Flexible Filly and I like it for the most part. It was a huge PITA getting it adjusted properly. I ended up emailing with ThinLine and also sent them a video and photos. They actually sent me a smaller size to try since my horse kept eating out of one of the sides rather than the hole. That fixed the problem – along with switching to a leather halter. A regular breakaway halter was just too floppy. I would feel more comfortable with a true breakaway halter but it’s all a balancing act. Oh and if you try it, just go out and buy a bag of replacement zip ties. Using the little bread ties that they send only goes so far. Zip ties are cheap and it will save in frustration.
That said, after using it all last summer and having it work great, I tried it again late this fall after we moved and somehow we started having the same problem again. I think I may have made the crownpiece of the halter one hole larger. But then it snowed and I haven’t bothered trying to figure out how to fix it.
I tried the GreenGuard as our first grazing muzzle option and it didn’t work at all. She could barely eat and even though could only do it by scraping her teeth on the basket. I might be open to trying it again now that she’s more experienced with grazing muzzle.
One big advantage of the Flexible Filly over the GreenGuard is that she can still groom other horses with it on.
I also have a Tough One grazing muzzle that I got on super clearance from SmartPak. She HATES that one. Refuses to even try to eat/just stomps around tossing her head.