Generally speaking, I like the updates and the new feel of the software.
The "selection" method has now changed such that, by default, members are unselected as opposed to selected. This will take some getting used to. V17 (and previous) was great in that you could unselect a member/node simply by clicking on it or using one of the line/window batch functions, resulting in a still slightly visible phantom version of the element(s); very handy when wanting to cut through congestion to focus on an isolated element or group of elements but still have a flavor for the overall spatial assembly. Now there is no "phantom" feature, so you either have to select and lock a member to get it out of the way (removes it entirely from view, no phantom/shadow), or flag it as inactive, which is of course not ideal.
All in all, I don't have any major qualms with the UI after having worked in it for a couple weeks.
That said, there are still some troubling bugs to be worked out, significant enough to erode confidence a bit. While I love RISA's effort to provide expanded Detail Reports, as recently as this past week the program was reporting the wrong equivalent rectangular stress block for reinforced concrete sections, and was calculating incorrect Cp factors for wood design so as to result in an overestimation of flexural capacity (and a corresponding lower reported UC). These are obviously important items that need to be addressed sooner than later.