They are best in their place as because they supports web development features with extra framework plugin like, Laravel, Yii, CakePHP, CodeIgniter, WordPress, Drupal, jQuery etc. This is the one tool that supports all the things.
By using this tools, they are very much lightweight. Speed, Reliable, Fast and good debugging facility. Although support version controlling system and FTP access as well.
I am not very much familiar with SASS and LESS but this software do support these kind of Cascading Style Sheets. Review collected by and hosted on G2.com.