I’ve been a member of NicheReaper since it opened its doors a couple of years back.
Keyword tools come and go; some like Market Samurai run on your PC, other like Keyword Canine run online through your web-browser. PC-based software tends to run slowly while online tools return results quickly. Desktop tools tend to require a single payment while online tools usually require a subscription.
NicheReaper was an online tool that required a subscription. As is NicheReaper 2.