Why should I use TA:Mutation?
There are lots of reasons to use this program.
Compatibility with others.
Total Conversions made easy.
Quicker multiplayer game setup.
Stop throwing away saved games.
Watch recordings of others easier.
  Recording your multiplayer games with TA:Demo is the same story but potentially even more frustrating.
In order to replay the recording, you have to have the same exact configuration as the people who recorded the game.
With TA:M, all you do is load the snapshot included with the recording and your game configuration now matches that which the players used when recording the game.
No more guesswork or trial-&-error.
Likewise, when recording multiplayer games, you should take a snapshot of your current TA settings, and when the game is done recording and you want to submit to TARBC, you can include the snapshot file along with the recording, so others can quickly match your settings and watch the recording with no errors.
Try out more than just your favorite Artificial Intelligence.
Organize 3rd party units in packs, or individually.
Backup was never easier.
The new TA phenomenon: The Mutator.
More people will use your creations.