It is only a good idea to use compression during tracking if you absolutely know what to do with it. People with plenty of experience using a compressor as an effect will know just the right amount to use so that it works well during mixing.
If you add compression now and just guess the right amount to use, then you could be screwing up the dynamic of your tracks and limiting your future mixing options. And if you are using a cheap compressor, you may be introducing the sound of the unit into your tracks, which may be a good thing-again if you know what you are doing.
Save the compression for mixing. Anything you add during tracking, be it compression or reverb, cannot be removed in the mixing process.
Cy