I have to chime in as a long time user of the original Flair. It is dead simple to get a truly excellent espresso. It is compact for travel, and equally great at home. The preheating is dead simple (I prefer using a moka pot base to both steam heat the brewchamber & boil my brew water.) The clean up is dead simple. In less than 5 minutes I have a delicious espresso.
Certainly, at the beginning, it seems like there are many things/parts to deal with; but once you develop a routine, it becomes second nature (muscle memory) and I would bet I can deliver an espresso & cleanup in the same time it takes to make espresso on a semi-automatic machine.
I don't use an expensive Stagg (just an instant read thermometer, but temperature strips work well, too).
I am amazed at how much better the espresso is from the Flair than espresso I taste from numerous other very expensive espresso machines. I can't praise it enough. The beauty of this device is that you can control absolutely every aspect of your shot (temperature, pressure, flow, volume, weight, etc)
ps
I get very consistent & repeatable results!