No expert but looks too narrow to me. Just wanted to agree with you on the point that most of the polo world do just throw any old saddle on- such a shame, i really don't know why that's the case :(
I have the Toggi Calgary boots. Have stood up to everything so far, and so comfy to ride in! The leg bit isn't too thick, so you have good feeling when riding (if that makes any sense?)
Cheaper than Ariat too ;)
Mind you my jod boots are Ariat and i love them
Have been schooling a lovely gelding for a friend, who is for sale (the gelding, not the friend :D ) and she is having the same problem.... maybe just rubbish market atm