I recently purchased Camtasia for Mac in order to make videos which capture what I am looking at on my computer screen(s). My initial opinion of this software is very positive and I think it is well worth the $99.00 TechSmith charges for the Mac version. I’m still learning how to use it, but seems to be fairly user-friendly. I hope to be posting videos made with Camtasia on this blog in the near future.
I recommend this product.
gmf journal 
Personally I use ScreenFlow for MAC and DemoCreator for PC. I tried the trial of Camtasia for PC.It’s great but too expensive for me. In fact, I just want to make tutorial video simple and useful to others. And that’s my real purpose.
Hope to watch your video ya.
Thanks. I will check out Screenflow too.