Update #1
The app charges $19/month and then you have to pay another $19/month for buffer!
Hell No! I can get cheaper and more effective options. The app obviously has no idea about this because they said it was FREE to use buffer when I clicked the link inside the app.
Update #2
So it seems that buffer automatically puts you onto a free plan after the trial period and there's no additional fees. It was a shock when I saw what I thought was an additional fee. The app is great but be warned, don't go posting too many posts in a row on insta or instagram itself will "ban" you for a day or so. This isn't an app issue though, it's 100% instagram, just a caution to take when using this app. I've found it useful and freed up a lot of time I spent just posting products.
I would give it 5 stars if it could also schedule other content like links to my blogs, links to other articles and videos. Also the ability to possibly associate hashtags with collections and then use those hashtags with the posts when the products are posted would be a great feature. Still a great app though!

The developers for this app are highly responsive and supportive in my experience. Issues have been very limited and attributed to learning to use and navigate the service; which isn't very complex at all. By far this is the only service of its type that is NOT excessively over-priced for the automation offered. I tested multiple services of this type that offered far less customization yet charged an unreasonably high monthly fee.

Not to mention, you are not limited to the free services on buffer when you sign up as part of this app, that is such a plus. As with any interconnected service, check the accounts are synchronized regularly, reconnect your accounts every now and then, and try not to add multiple "auto posting" apps and the service runs very smoothly.

Regarding limitations, the limitations are more-so bound by the social media platforms the app is posting to. In our best interest, the app has specific media manually approved to satisfy the platform's requirements and keep our accounts in good standing, and the approval literally requires a one button click to approve all.

I definitely recommend this app, especially to smaller merchants who don't have the means to invest $100 or more a month into similar automation services yet.

Good Job Team!

Finally had to delete this app for good. Wasted time and money over a few months. Shopify needs to discontinue Auto Post and partner with either Buffer or HootSuite. This app works sporadically, is redundant, and the owner is verbally combative not customer focused at all and their located guess where overseas in India or somewhere. The app is total trash. Do not believe these other posters giving 5 star or 4 star reviews. You should be able to select your products, set the time, and forget it. Nope they have redundant choices built into the app which make no sense. They do not deal with Instagram directly but have your posts go thru Buffer and as result all your posts go thru Buffer and post the same products 2, 3, 4x times over and over which looks like spam and can get your account banned on FB & IG. Spoke with Shopify and Buffer at length before I decided to cut this app and delete it and the both agreed the app is no good. Currently using Outfy which is also not as good regarding the pricing algorithm. Overall there is no reliable replacement. These apps promote a lot of hype but leave you assed out and stressed out.