I discovered Google+ a couple of days ago, thanks to my good friend Draz. I have to say that I am quite impressed by Page's team work on this. I know, one should not compare it to Facebook, because it was not intended to compete with it. Yeah, right...
It does a lot of stuff that Facebook does not do too well, or similar stuff but slightly better. To be completely honest, it also does a lot of stuff less good than FB: refreshing is a bit random, some elements don't really display too well and posts with too many comments will take ages to load. But this is fairly acceptable for a service which just began and it got most of its functionality right from the start.
I still think some stuff needs improvement. For instance, while the interface is very slick and easy to use, I think that post + comments still take too much space on my screen. This makes having an overview of the recent posts a bit uneasy. There also doesn't seem to be much in terms of business related areas. But I am sure it will come at the time they chose right... If I may present a suggestion to the Google+ team, I think they should concentrate on allowing more integration by the users of their own existing Google content in Google+. I am thinking of Blogger posts, Google Docs, Google Calendar events and so on. Speaking about Events, I believe it is the major way to go. No free social platform (except Meetup) ever got this right. If Google+ manages to get Event handling in a decent way, they will simply take over the social scene.
All in all, I am favourably impressed. I noticed that my time on Google+ is already largely surpassing my time on Facebook or LinkedIn. I doubt it will replace these any time soon, but it completes them nicely and I have no doubt that Google has created a very successful (not so) new social platform.