Howdy
Actually its better than a paracoor, which ironically is more expensive and increases the focal length of the scope (making it slower photographically) by 1.15x
The MPCC doesnt alter the focal length at all
heres a review
http://www.licha.de/astro_review_mpcc.php
The Paracorr is $215 USD, the MPCC is only $144 USD
Scott