The best feature is that it gives me an overview of my user base in one place as well gives insights into their session time-frame for different events such us page load or error handling etc., I love its simplicity and ease with which i am able configure everything from scratch without any third party plugins like P3P (Platform/Frameworks).
Nothing really dislikes here although minor issues but nothing serious either! Have been using this tool since last 1 year now by itself we have got most out features solved very efficiently & effectively! And moreover support team always helps when needed too!! We use trackjs mainly tracking our website performance metrics along side other tools provided within Webgrind / GTMetrix API's apart form above mentioned main benefit are :.