Don't get me wrong ;-) I have used Qimage for years, and i will continue to do so. When it comes to quality output on paper, nothing beats Qimage.
There are, however, some "issues" with the interface of the program I (personally) would like to see changed into a more "modern" and easy to understand look.
If the goal is to "have lots or pretty looking sliders" then LR does okay with that, but in many cases, sliders don't do the job as well. Highlight recovery is a good example. In LR, you drag the slider while eyeballing areas of the image, guessing whether or not you've recovered enough of the highlights. In QU, you simply mark the area of highlights you are trying to recover, and it recovers the specific highlights you are working with: no guesswork or eyeballing. When trying to recover highlights, you are already looking at a section of the image that needs highlight recovery. It might be one area in clouds or the tip of a bird's feather, so just mark that in QU and you're done: it examines the area and recovers as much detail as possible. No need to "slide and guess" (and ultimately end up just short of the goal most of the time).
Another good example: they even use sliders to adjust horizontal or vertical print size (what they call "cell size"): dragging the corners of the actual print or picking from a list of standard (or user) sizes is much more appropriate. While they do
also allow you to drag corners of prints to size, they don't rearrange other prints to fit on the page when you do resize one print, leaving you with more work to do on other prints on the same page to move them out from under the one you just made bigger, align them manually, etc. So LR has plenty of sliders, but they're not thinking about the end game: ability to easily arrange and print multiple photos at optimal quality. So in QU, if there's a slider, it means a slider is the most appropriate tool for the job (levels for example). If there's no slider, it means another tool does the job better. I don't put a slider on everything just because I think "sliders are trending".
Mike