I recently updated my website from CE4 to BL2, then to BL3 when it was released. I took the opportunity to redesign my site and go with a dark theme, which seems to be pretty common practice nowadays.
Backlight is a much less frustrating experience than the CE series and the Lightroom web module. It’s amazing how many more of the features I had to do with PHPlugins and custom CSS in CE4 are now baked in. I have been able to get away from PHPlugins altogether, which is greatly appreciated.