Not wanting to put words in the OPs mouth, but I think he wanted feedback from others to help in future buying decisions. In other words, if the consensus was that higher end brifters lasted a lot longer or were functionally superior, it might affect decisions down the road.

Personally, for many people, Sora is quite good enough. I've talked with experienced mechanics who say the biggest difference in levels is weight and appearance. Not necessarily shifting performance. I've used Dura Ace, RSX100 and Tiagra brifters, and had good luck with all of them.

There will always be those who just have to have the best. They will turn their nose up at Sora, and even 105. Whatever helps them sleep at night...