Help with EOTech 522 magnifier

[played]

Edit: EOTech 552 not 522


Deciding whether to buy:

http://www.amazon.com/Mako-Magnifier-Reflex-Sights-Generation/dp/B001LZV55C/ref=cm_cr_pr_product_top

with

http://www.amazon.com/Vortex-Optics-SM-01-Swing-Magnifier/dp/B004UMBEPE/ref=cm_cr_pr_product_top

or dishing out the cash to buy the EOTech magnifier setup itself. Is there anything I should know about the first option?(risers, better mount, etc.) Any suggestions?