Norton Spring Flexi Tree Saddle? Are they any good?

[Riderandthecity]

Thinking of buying a Norton Spring Flexi Tree Saddle for my TB mare. Anyone got one and recommend? Or any other alternate ideas/comments?
Thanks

 

[sbloom]

The price is tempting so they are asked about frequently on here:

http://www.horseandhound.co.uk/forums/showthread.php?t=511960&highlight=norton+flexi+saddle