I got an invitation to the survey yesterday. I've been using SolidWorks since its initial 1995 release. I have been, on the whole, very happy with the software until now. Bugs not being fixed, crashes, and the UI color change abomination have changed my opinion and I told them so in the survey.
There are several things in 2016 I'm wanting to use, but you know what, none of those things are imperative to my work. I can still get my work done without them. I have honestly given the new UI a try and just could not tolerate it. The partial solution begrudgingly given to us in SP3.0 is not enough.
I've weighed the pros and cons and have decided I can do without upgrading SolidWorks until this UI is really fixed. The survey was a perfect opportunity to tell them just that.