Alright, you asked! Sorry if it's a little negative, but I hate synthetic tack! Here's my opinions:
SADDLE: It only comes in a medium tree. Is that what your horse needs? Also, it is "All Purpose." Meaning it won't be perfect for jumping and it won't be perfect for Dressage. It will be mediocre for both.
BRIDLE: Link states "reins sold separately." But you said it includes reins. Not sure if we got the right link. Either way, it's synthetic and the reins will be all stiff so the excess won't fall nicely at your horse's shoulder. Kind of like brand new leather reins are kind of stiff. Except these will always be like that.
LEATHERS: I think the only difference between Wintec's webbers and "stirrup straps" is how they buckle. Webbers have a different attachment thing that doesn't bulge under your thigh. I rode in a saddle one time with Wintec "Stirrup Straps" and they had a tendency to slide back and almost come off the stirrup bar.
GIRTH: Actually, a pretty good schooling girth. Stainless roller buckles and slight stretch.
STIRRUPS: Basic irons. They look decent enough.
BIT: A nice bit. Have you considered a double jointed bit such as Korsteel's French Link or Oval Mouth?
SADDLE PAD: You wouldn't be able to show in this pad if you ever wanted to. I actually bought a cinch by this brand and material and it is decent. Not as thick as I would have expected, but it is made in kind of a double-layered waffle design so air can circulate. The description says that the pad, "Increases your horse's endurance." ha-ha I don't know about that!!