These on ramps at Oregon/Embarcadero, Charleston, Rengstorff and Middlefield are all horrendous and major accident waiting to happen. I have used them all and none of them are safer choices.
I am looking forward, eagerly, to the construction to be finished but I rarely see signs that they are working to finish these short merges asap. In the meantime, I find myself using Central Expressway, Foothill Expressway and 280 much more than I used to just so that I don't have to negotiate these dangerous onramps.
In an attempt of easing my frustrations by sharing our near misses, I am starting this thread as a stress releaser. Feel free to join me in my rants.