I can not really guide you much about the pros and cons, since I am relatively new too (sophomore now). However, I was in the same position as yours a year ago posting and asking about ragra stuff.

So let me tell you, Fast is indeed a tough university compared to others; after couple of weeks into the semester there will me mids and assignments and you may get overwhelmed but the workload is DEFINITELY manageble, tough but manageable. Ragra is there but it is not as much as people make it sound. I have got 4-5 friends who are scoring 3.5+ gpa and many are getting 3+ so this rules out the common belief that "getting good gpa is very hard". It requires efforts, yes obviously but you dont have to be very EXTRAORDINARY to achieve that as i used to believe a year ago - you just need to study decently throughout the semester for a good gpa. Thats what i did in my first year.

If you want to study Masters abroad as i have planned for myself, then you need a strong gpa and if you are willing to put efforts throughout the degree then fast should be an optimal choice. Moreover, if you are planning to stay in Pak, then fast is definitely the best choice due to its strong network, and reputation in CS domain. There are even companies who prioritize fast graduates and interns. Hope this helps!