I tried the Trico brand, and the driver's side couldn't totally clear the water from the windshield from day one. Neither worked as well as the 2 year old OEM wipers.
I ran them for 6 months, and ended up putting the original wipers back on, and those are still better than the Trico blades.
In a month or two, I'll drive the hour to the dealership and get my warranty set...
Given the lack of satisfaction from the Trico's, which I had no issues with on other vehicles, I haven't bothered with the Amazon offerings.
I did use Amazon for the rear wiper arm on my Impreza, which included a blade, and that combination worked flawlessly.
But that isn't a fair comparison, a small blade to a much longer one, that has rain blowing directly at it.
Unless someone else has actually tried the off brands on the front, and replies here, you might be the guinea pig.
Edit: Also possibly part of the reason behind the pricing, is only other than Subaru,it is Toyota and Acura that use this style of blade. They are a little higher end, and it is not as common.