I like that it is free, easy to use (even for novices), has great reporting capabilities as well! It can be difficult at times if you are not familiar with using command line tools in Linux or Mac OS X environments - but there's plenty of help online from their team members who really want this product succeed so they're always willing & able give assistance where needed when something isn't working quite right yet again :) Definitely worth giving them another try after some time away since we were having issues last year before switching back over now all seems good once more ;) We have been looking into various ways how our users could check up whether websites/servers go down regularly without actually visiting each site ourselves everyday which would take too much effort /time etc...
This was one solution found by someone else already used successfully here within my organization thus far :).