I've never seen or tried another screeners/backtesters which had operators and criterion like that of the RW although they charge a greater prices! I did see one interesting thing in other back testers - that is, the 1 day holding period. I've backtested the momentum anomally (without Zack's Rank = 1 obviously as the other screeners don't have it) over 1 week and 1 day holding periods. The return were maginified upto 4 times!
Is it possible to include a 1 day hold feature; although this would take a lot more time to process it is really good to have as some people (like me) have time every morning to make trades. My broker fees are also good so I can manage my trades eryday.