I have used Action! for many hours and a long while. And I would like to put down my review for this software. When Action! works, it does a good job in capturing in-game video (as well as desktop), recording voice and webcam. Action! has good options for customization compares to say, AMD Gaming Evolved Raptr - which is free by the way. From the quality-wise and when it works, Action! does a much better job than Raptr (free). But Action! does have it cons that you may wish to be aware.
 Action! crashes often
I use Action! to record in-game videos and post them in YouTube. Action! crashes almost every day. At times, several times a day. I have experienced this for as long as I have Action! Even changing hardware would not help.
What this means is that you may spend 30 mins recording an in-game scene. Just as you stop the recording, nothing happens. Toggle to desktop you would see it stops working and force closed by Windows. You would lose all 30 mins of footage. That happens to me often. Some footage may need another week's wait to have it recorded (like MMO raiding with weekly lock). So yes, I have put up with this for almost every day.
 Action! may not start recording the moment you want it to
This does not happen often. But there are instances whereby I lose a chunk of video footage at the beginning.
 Action! may not work for your recording device
I have a home studio. I have a digital USB mixer Zoom R24. AMD Gaming Evolved Raptr (free) is able to recognize it and record my voice as well as in-game video with no issue. But not with Action! I tried writing into their forum (see point 5) but there was zero help. Finally, I spent money to buy a Blue Yeti in order to work with Action!
 Action! may not save your setting if you shutdown your machine without exiting the application
For the longest time, I was puzzled why I need to adjust all the settings every time I open up Action! I have to re-adjust mic level, positioning of webcam, size of webcam window as well as key binding. Every single time I start my machine. I wrote into their forum, reported this issue but received no help (see point 5).
Then I accidentally discovered that Action! only save my settings (at least for me) when I properly exit the application and not let Windows shutdown closes it. Also, I have also discovered that Action! crashes less when I exit the application after changing the setting and re-open it again before recording. If I change the setting on the fly, there is a high chance Action! will crash.
 Their support is non-existance
Whenever I discovered a bug, I was used to write into their official forum. I thought that by actively engaging them, they would make a better product. Well, they do add a lot of new functionalities (that I don't use). But they never respond to any query or issue I have reported.
Hence, in view of the above, although it is of my personal interest that they should continue to sell and support this product, I am unable to endorse Action! for you to purchase.