I actually do like the latch on the E-stop. Though I have bumped my head against it more then once, but for me I think it just stopped me from hitting my head against the scroll
As for all the added decorations on the Robertson's extension they do have a purpose, and that is when you are fingering a note you have a physical reference, something I wish mine had. I do wish they moved easier as well. On mine I am so used to just being able to run my hand down the string and open up a gate that I have hurt myself on a few extensions trying the same thing. The one on my bass is David Graham's first extension.