I have used their data in the past. No data source is "perfect" but no big complaints with the symbols I was testing at the time, mainly metals & energy.
What symbols are you specifically looking to test?
For eod data, you can't go wrong with TC2000 from worden. I have used it for over a decade. I found yahoo eod has too many problems and errors. Plus TC2000 is supported natively by many trading packages and can also export price data as ascii-text.
Try these links for S&P futures (ES) or S&P Index (SP):
https://www.cqgdatafactory.com/?page=search (use F.US.EP)
http://pitrading.com/historical_data.htm (under market)
http://www.tickdata.com/ (under futures or indicies)
The PREM indicator was a little difficult to find, but try the 2nd link...
Let me be more specific: unlike grain that does NOT include volume at all, kibot's volume field is included, just don't use or rely on it as they are kown to be unreliable.
Do your research and compare for your needs, but from personal use, I would lean toward pitrading or grainresearch.
Quickly reviewing the '90%Success Rate' source, you will find it difficult going to Metastock.
Porting from MetaStock to other platforms is easier than to Metastock. Metastock has too many limitations on how entry and exit rules.