Just the incompatibility with widely available (clone) tips is enough to turn me off. Long time ago I was interested in the TS80, but I changed my mind as it also has a relatively small selection of tips, and I do not really need the small form factor. I thought about T12 clones for a long time, but in the end I decided on a C245 clone from GSGER. I thought about buying only the parts I need, because I do not trust (or want) the power supply in it, but buying parts (solder stand, iron, handle, wiring, control board, spare tips) was too much of a bother so I ordered a complete set a few days ago. I'll see how it will go, but I still plan to use a decent Meanwell 24V 10A power supply.
I will probably buy a few spare PCB's (with uC, encoder and display) just to play with. One of the reasons I find these things attractive is because there is open source software available for them. I don't care much for most of the complicated functions, but with Open Source firmware it's quite easy to fix some (remaining) bugs or add small features.
One function I would like is a "boost" function to get the temperature to 450c or so to burn off the coating of "enameled" wiring. A hotter temperature also helps with soldering TO220 to a big GND plane.
And for the 24V 3A transformer in this Quick soldering iron, as other have already said, you can overload transformers significantly for short durations, so it's plenty to get an occasional 100W burst out of it. With industrial servo motors this is normally explicitly written in the specifications. for example a 400W 1.3Nm servo under continuous load, can hanlle up to 3Nm torque peaks. With welding transformers it's the other way around they often specify the maximum power they can deliver, and looking deeper you see they can only handle this with a 20% duty cycle. With mains transformers, the print is normally for the continuous full load, but you can never be sure with the chinese.