I really am a fan of Mylers, but as with all bits and horses it depends on what they like, which Myler you get, and the shape of the bit vs. the mouth.
We have three Myler comfort snaffles at the moment. One level one smooth, a level 2 smooth, and a level 1 twisted. We also have several Myler shank bits in all the levels and various shank lengths. My mare loved the short shank level 2 but absolutely went crazy with the S shank level 3. My colt prefers the twisted level 1 snaffle, anything higher than a level 1 and he doesn't like it much.
I would see about borrowing before you buy one, in differant levels. The higher the level the more tongue relief you get but also the more palate pressure you get. You don't want to end up with a level 3 because someone else's horse works great in it only to find your horse has a shallow palate and can't accomodate a bit like that, but they could manage a level 1 or 2 and still enjoy it.
Pssh.I didn't pick up the wrong lead
It's called a counter canter...
...A very advanced maneuver.