Vitals: Reviews, Bundles & 40+

By far THE best support ever from an app developer!
I had a lot of problems in my store which were all caused by other apps that left lots of code on my site causing speed issues and other clashes.
I found that the most useful part of this app was the automatic currency conversion (only one that works with Shopify's new multi-currency!) but it's a great advantage installing just this one app as installing lots of different apps causes site speed problems. Highly recommended!