Been reading this forum for a while but I may as well lose my posting virginity some time...
I too bought one of these TS100 soldering irons, along with the 19.2V power supplies, from Banggood.
I have found it to heat up very quickly and hold the set temperature whilst soldering.
The length of the tip from the body is not a problem for me during usage and I have rather large hands.
I do not have any experience with high end kit such as Hakko, Metcal etc. so cannot make any comparison
with those, but I much prefer this iron over the likes of cheap unregulated irons, unregulated Weller 25W,
Aoyue 968, or various butane pencils that I have used in the past.
My $0.02