i currently utilize fund estimate and its gives a ball park but can be way off. for example two days ago it missed profunds japans price by 2.40%. actual was 4.30% and fund estimate showed 1.90%. the european and japan are a lot more volatile than the sectors but that isnt even close.
last night i did a check to see how it did on rydexes sectors. of the 13 i checked it was off by an average of .33% from an avg change of 2.16%. so they missed by 15%. for me that is unacceptable. im glad it is okay for you.
we will agree to disagree on this and leave it at that.