Cheap is as cheap does. You buy cheap, you get a cheap saddle.
IMO Bates and Wintec are designed very poorly and do not place the rider in a good position. As well they tout the "system that fits every horse" which is a complete lie. Anything that touts "one size fits all" needs to be run away from, quickly. They fit some horses OK, most horses not at all and very few horses do they fit well.
I much prefer a KN, Passier, Stubben or other good quality saddle which is designed well. It is not difficult to find a good quality used and fairly inexpensive saddle which will usually fit the horse far better than a Wintec.
Wintecs and others are good starter saddles, but IMO as soon as a person has decided to go down the path of dressage, they need to be in correct gear, and that includes a proper, well fitted saddle.
They say money doesn't buy happiness -- well happiness doesn't buy horses!