I was an affirmed Weller user. Soldering, Desoldering, large irons, needle-tip irons...
Used my first Hakko when my 'Magnestat' Weller let me down. -Again.
-I've replaced magnestats and heating elements several times over the years. but in the last 16 years since I tried my first Hakko, I think I've replaced one heater element and perhaps a wand cable. In that time I've never ONCE encountered the 'cherry-red-glow' of a stuck switch (and a dangerously overheating tip) with which Weller TCPs have regularly and repeatedly 'surprised' me over the years.
There are better irons out there than Weller AND Hakko... but I've sold almost all of my Wellers now, and the two which I still own... I haven't plugged either one of them in for at least five years.
But... Good solder, good flux (silly question perhaps, but you ARE using rosin-cored solder, -right?) and clean bits which are to be joined... then a tip at the right temperature, and NO MOVEMENT WHATSOEVER until completely cooled to below the eutectic temperature.