How's the data quality of OptionWorks? Do they have the indicies? I bought several years of EOD data for SPX from https://www.historicaloptiondata.com/ https://

How's the data quality of OptionWorks? Do they have the indicies? I bought several years of EOD data for SPX from https://www.historicaloptiondata.com/ https://www.historicaloptiondata.com/ and found it to be of only moderate quality. (Charting some of the data on multiple dimensions makes the stuff that is padded stick out like a sore thumb... I ended up tossing about 20% of the data).