I bought 2 Thinplug to figure 8 lead, all my multiple usb chargers are 100-240V in and figure 8 is also the input end of my Lenovo powerbrick and CPAP machine. They look more solid, molded and there is no moving or folding parts in the current carrying path.
I prefer a single solution as opposed to plug adapters which are not as solid.
In my office and new flat in HK I use full size leads. I have also added 110V wiring and US outlets in my flat.
These earth pin folding leads are for UK, S'pore and M'sia trips. When I am in Canada and US I just use the US version of the figure 8 lead.