Thanks so much for sharing this really useful comparison Christopher 
With regard to the heat pump bit of the driers - am I guessing right that it separates the moisture and the heat to heat the room while water is drained into a vessel on the machine, which you empty after use?
Yes there is condensate to be dealt with, as with condensing driers. Either empty a tank, not sure how often, or you can connect to a drain if this is practical/possible (a bit like a washing machine.
Another bit of info from Which? attached that explains in more detail.
Heat Pump Tumble Dryers - Which .pdf (3.6 MB)
I have a Meaco 12l machine.
I haven’t done a cost benefit analysis as I use the dehumidifier for other things, that you wouldn’t use a traditional dryer for.
The power consumption hardly shows on my systems but I do see a small drop in battery charge if the sun isn’t shining.