Hi,
The Dual Speed Moonlite CR2 is an excellent focuser. In terms of retrofitting to a newtonian, it is clearly at the top of the available options and bettered only by the dual speed Feathertouch from Starlight Instruments.
Having used the Moonlite CR2 countless times and having a Feathertouch fitted to my 18" Obsession, I would never buy any focususer other than a Feathertouch ever again. It is only about 10% to 20% more expensive than the Moonlite and in a different league all together.
http://www.starlightinstruments.com/
Cheers,
John B