The ease of use, it just works! It doesn't matter what you do with your site (a simple blog), statuscake makes sure that everything else still functions properly - so if I'm away for an afternoon my users are none-the wiser in terms of content delivery issues until they try clicking around their pages/sites at which point any errors will be displayed by this software package!! They have been very helpful during our training period too where we were having some initial teething troubles understanding how best to implement its features across multiple sites & platforms etc.. We're currently using version 4 but there seems no end yet to new developments coming out all the time :) Highly recommend considering them firstly because once implemented things really don't get easier than implementing these tools into production environments. Our customers love seeing updates made live via text messages without.