I installed it and played with it some.
I agree with Derek and Hubris; it is very similar to the built in troubleshooter found in the control panel; but it seems to be a little more advanced and more thorough.
I ran the HomeGroup, Performance and Shared Folders modules. Since I am not experiencing any actual problem, I opted for FixIt to show me solutions and let me choose rather than automatically fix problems.
I think the HomeGroup module is pretty good. I wish I had this when I was struggling to get HomeGroup working. I believe it would have diagnosed most of the problems I was having. The module looked at the services affecting HomeGroups and that would have solved a couple of problems of posters here that I have read.
The performance module did not seem much different to me that what is found in the control panel's Performance, Information, and Tools. Since I am not having any performance problems, it basically took me to Startup Programs and suggested that I uncheck any startup programs not needed to run at startup. I am not sure a noob would know what needs to run at startup and what doesn't. However, I know a lot of new users are not aware of the startup programs option and so many programs install themselves to run at startup. So I think this is a good thing.
Overall, I think Fixit is on the right track and will be a good, useful tool for less experienced folks.
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Don't use this if you don't feel confident in having to go over all your settings to get back to where your system was set up to your liking.!!
I endorse this 100%. I recommend that FixIt automatically create a restore point before any changes are made.