InstaZOod is quite easy to use, has good features like scheduling posts in advance or for any specific day of week etc., can be used as standalone tool without an account (in that case you need only 1-2 minutes per post) so it makes things much easier when compared to other tools available out there - no monthly subscription needed, also have more than 50% discount if paid via PayPal :) I've been using this service since few years now but i am still not able to get myself familiarized enough about everything they offer! The best thing would definitely be their support team who are always there at your beckon call whenever something goes wrong.
But apart from all these positives its UI could look better which might make users feel comfortable while interacting through app interface :). Scheduling content before posting them saves time too!!