The old RSX levers are WAY better than the new Sora and Tiagra stuff!!!!

Totally different unit -- can't compare them.

I can't remember if it's the RX100 or the RSX, but one of them was apparently the exact same mecahanism as the 105, but with a different cover.

I still have RX100 and RSX levers working perfectly, and my similar 105 levers (mid 90s) are only just starting to wear out after about 30,000 miles!!!!