I recently ran into NextGen Pro (while seems like it offers some nice features, the reviews are completly mixed a few people saying their website crashed after installing it and others saying its working well. A little unsure of what to make of this plugin especially considering it comes with a premium cost. Firstly have you heard of that plugin and is it worth taking the risk of purchasing it if it does not work? could not see any money back guarantee on their site.
Secondly are there any alternative plugins that offer ths same kinds of features
NextGen Pro - http://tinyurl.com/ndmmclw
reviews - https://wordpress.org/support/view/plugin-reviews/nextgen-gallery?filter=1
Site that i would like to replicate features - http://tinyurl.com/6u2
my site - http://tinyurl.com/of3qvfv