Honestly, the version they have is about as refined as they are going to get with it. There have been software changes that make the display better, and it's hackable so that you can make your own VFO for it etc, but the design has some fundamental flaws. To put it in perspective, v5 and v6 are almost identical except for the display. All of the same CW, layout, output, etc problems exist on the v6 as they did on the v5.

Keep an eye out for the QRP Labx QSX. It's been in development for a long time but will probably blow everything else out of the water, even things costing 10-15x as much.