I like that it's interactive, which is something you can't find with other courses of this nature (I've taken over 20 different ones).
It also has great content for all levels from beginner to advanced user! There are not many downsides if any at least as far what we have used sofar; however there could be more videos available depending upon your skill level - but they aren'y too difficult or complicated either way once understood/learned basic concepts first-hand using examples provided by instructor(s) through out course material itself.- We use kontra when dealing wth clients who needs some forme dof penetration testing / pentesting services where our team does those tasks manually without automation tools such us metasploit etc., hence making them vulnerable since manual work takes time & effort thus increasing their risk factor while performing these activities compared ot automated.