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Pros
Pro Collates deals from all over the internet
Find out about a wide range of bundles from a variety of sellers
Pro Easy check for reputability
Rather than trying sellers blind, you can see what the community has to say about both sellers and deals, as well as comments saying if you can get the same options cheaper elsewhere.
Pro Huge list of sales due to crowdsourcing
Due to the large amount of users (355k) this allows for a constant updated list of all the sales on games across the internet and box stores to be listed and updated very frequently.
Cons
Con Some sales may be missed
Due to the crowdsourcing some sales may not be caught by the users and posted, so is not a full proof system to catch every sale out there.