Goibibo was a late entrant in travel business but I must say that with their aggressive business approach and experience in internet business they have manage to build a fantastic travel portal.
Goibibo has a superb interface, informative and user friendly. You can find the details of almost all the hotels in India, you can do flight booking, domestic and international at unbeatable prices. They offer lovely offers, which you will find on the payments page, especially for hotel booking no other site(makemytrip or cleartrip) can offer the pricing, discounts and deals that you will find on Goibibo. You can find hotels at almost 50% discount.
Their app is also very user friendly and they keep updating their users with the latest deals available.
Pros
1) Unbeatable Prices - Especially for Hotels
2) Good Design and Interface
3) User Friendly
4) Good Customer Service and Support
Cons
Frankly I could not find any.
So next time you plan a holiday, goibibo would just make it more pleasant.