Google recently launched a new feature for social media. After growing rapidly during this time, Google provides Google+ commenting feature to developers. Google+ has many users make some people apply this feature on their website. Google+ linked with Google accounts means anyone who has Google account can comment on your website. Then the question is, "Whether all of your readers will be able to comment?".
This is what should be your primary consideration. For example, your readers use other services such as Yahoo, MSN, etc. Of course it would be a hindrance for them to simply comment or ask questions. Especially if your website are related with tutorials, developing tricks, design tips, etc. You should give a well community. But if your website are related to AdSense tips, Blogger hacking tips, and another things are related to Google and its services, Google+ commenting system would be a great feature.