Yes. I believe it to be true. I can't be sure if it is 168%- but it is an obvious glaring improvement.
I had a cheap-o 48" light fixture with 220w of PC lighting (4x55). I took it apart to pull out the crappy flat reflector, and add some of the AH supply reflectors instead. I had to remove a bank of lights to fit the new reflectors. I have to say that IMO it is brighter with one bank of lights (110w) and the AH reflectors than it used to be with 2x the wattage and lousy flat aluminum reflectors.
I have to say I am a die hard DIYer, and there is never a time that I won't put in more work to save the cash and have the satisfaction of making it myself and usually coming out with a better product, but in this one case, I would absolutely without doubt go with the AH supply reflectors.
The plural of anecdote is not data