I am bery picky about a clean windshield and insist on wiper blades that work. I went through a period where I bought almost every imaginable blade on the market and finally cam to the following conclusion:
Buy the cheapest blades and replace them often. As soon as the wiper blade starts to streak, chatter or otheriwse not clean the windsheild to my liking, the blade is gone and I will install a new blade. I will replace wiper blades about every 4 months.
I use Rain-X which helps the bugs clean off easier as well as help the blade glide over the glass better.
I think the weather has a lot to do withhow long the wiper blades last. Rubber deteriorates under UV light and down in Texas our sun is like a torch. I find that a few blades will last 6 months or perhaps a bit longer, but they cost 3 or 4 times or more than the cheap blades, so they are really not cost effective.
So again I will state that the best bargin is to buy a cheapo blade and just replace it more often. I am talking about replacing the rubber refill, and not the whole metal wiper blade assembly. I only replace the wiper blade assembly when it gets worn to the point that a new rubber refill does not work......But that takes about 3 or more years.
...Rich