There is a guy on YouTube brewing on a Maischfest. Look for Yorkshire All Grain home brew on Klarstein mash boiler by S King. I found it quite helpful when I got mine.
I keep the heater running during recirculation...and take plenty of temperature readings as the Klarstein temperature readout is not particularly accurate.
I recently bought a Maischeft for £178 with a 24 hr discount code on the Klarstein UK website. Very happy with it. Hooked up a pump for recirc. I have an 8 litre Urn wih temp control which I use to sparge using a 2 litre jug, poured slowly over the grains. Works for me as I tend to brew 15 - 20...
I made my first brew in the Klarstein yesterday. Agree with all your points guys. User guide is a joke. Temperature readout innaccurate. However, I enjoyed myself ......just got to clear up the mess !