Digital BW, The Print

Greetings,

Any comments on the use of photoshop B&W conversion plug-ins? As  a
first class newbie I am finding them useful until I get more
conversant with the different PS techniques.

For example:
Powerretouche:http://www.powerretouche.com/Black-white_plugin_
introduction.htm

PixelGenius:ttp://pixelgenius.com/photokit-gallery/index.html

Thanks

Drime