I came across G2 for one of the software I was looking for my project, and after reading reviews from G2, I made my decision very easy to go with which product exactly in terms of performance, security, stability, and user-friendly interface.
They have this features tab, which summarizes all the main features of the product based on the reviews given by the customers, and it really helps to quickly surf the pros and cons rather than exploring several other reviews websites. It's the "ONE DESTINATION FOR ALL THE SOFTWARE COMPARISON".
Their website's review system is so well designed that it is very easy and convenient to give reviews.
With G2, I have also provided few reviews for the software which I have used personally.
G2 doesn't blindly update any review on any product since it may affect its reputation. They have a whole team of moderators who validate all the proofs and then upload the review which actually gives proper detail and impacts about the product.
I have recorded a video review as well with G2.com, where the online director was very friendly and really helped me a lot in making me comfortable to shoot one of them.
They even give rewards for the same, which is also exciting :D YAY! Review collected by and hosted on G2.com.