That fantasy power you reference is predominant on 11m mostly. As far as hf radios and the power meters I have slways found then to be as good ad any external meter of decent quality. Not a gigadollar meter mind you but an average decent meter.
yep, i don't disagree, fantasy power does predominate on 11m, well the part of it that isn't harmonically radiating all over the spectrum anyway.
i think you have to be realistic in your expectations of 99.99% of any power meters, even decent ones tend to be around +/- 5% at best, but then there's very few genuine cases where people actually need better accuracy than that, maybe if your trying to get fcc certification, but for hobby radio of any kind its overkill.
its far more important knowing your signal is clean than it is knowing if it is accurate to the nearest watt, but i'm sure there will be no shortage who disagree.
if anyone can tell the difference between a 95w signal, a 100w signal and a 105w signal which is plus or minus five percent i'd be very impressed.