I use Camtasia and love it. Nice clear sound and really easy to take out your stumbles and stuff if you want. You can also use it to record your desktop if you want to show students something other than the powerpoint. I use it with Word and Excel to demonstrate things.
You can download the free trial which is a full version and try it out for 30 days without any cost before buying it, so try it out and see if you like it.
I also use Camtasia and really like it. I don't use PPT, but I work out math problems in a word document or show them how to use their calculator. It's super easy to use. I also keep my "lectures" to under 10 minutes, many times recording several videos for each section. Not all students that watch them, but the good ones do. They like that they can stop, rewind, and replay them.
I originally used Jing which saved to .swf format and then got Camtasia mid-semester. When I tried switching to mp4s, the Mac users complained. So I went back to .swf (flash). They do not watch on their phones, they watch on computers. (Well, the course software is in flash, so they can't do it on their phones anyway.) I think that also prevents them from uploading the videos to YouTube, too :)