Sora 3500

Hi I have been running 105 on my commuter bike but when it needs replacing i'm thinking of changing to the new sora 3500. now its dropped the thumb lever to shift down I think i'd get on better with it, obviously its only going to be 9 speed but would the performance be really noticably worse?
has anyone used the new groupset?
has anyone used the new groupset?
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