For the money the best EDC light for general purpose use is probably the Zebralight SC63w. It puts out an absurd amount of light and is smaller than some older AA lights.
I find the switch on the Olights to be kind of crappy and prone to accidental presses. In general the tint of their light is very blue which is for me at least very offputting.
If you must have a tailswitch I'd look at Armytek or an Eagletac DX30LC2 with the Armytek tactical models being the preferred for hard use because they have a much higher impact resistance rating.
No. Everything that I am aware of in the sub $100 price point is made in China.