Is there any simple and quick way to use Mikrotik with router OS L4 to work as failover element using 2 or more WAN?

So far i have found these links that seems useful:
http://www.jpudasaini.com.np/2013/05/simple-failover-mikrotik.html
http://wiki.mikrotik.com/wiki/Two_gateways_failover
http://wiki.mikrotik.com/wiki/Advanced_Routing_Failover_without_Scripting
http://forum.mikrotik.com/viewtopic.php?t=81679#p408513
http://www.helpadmin.pro/how-to/how-to-mikrotik/how-to-mikrotik-failover/64/

Anyone tried these or know other way?