I have toured for more than 10 years using twist shifters and found them good. Obviously the brand will have some say in this but over this time, I had to replace the shifter once when it wore out.
My current bike is a LHT with bar end shifters and I was concerned that these may not be as good as the twist shifters but have soon got used to them and would not go back to the twist shifters.
One advantage of the twist shifters is that it is possible to make small adjustments to the front deraileur if it starts to rub as you go to the extreme gears on the rear cluster (turn it another click to stop the rubbing).