The Shopify app store has real AR options with reviews from real stores. That is a gift. Use it like a cynic.
Here is the checklist I would run before installing anything. One, file formats. It should handle GLB and USDZ, the two formats covering Android and iOS. A plugin speaking only one format serves half your traffic. Two, page speed. The viewer has to load fast and lazy. A plugin that drags your product page down costs more in lost conversions than AR gains back. Test on a real phone, not your laptop.
Three, where the button lives. Buried or ugly means shoppers never find it. Four, analytics. You need AR opens, dwell time, and AR-user conversion versus everyone else, or you are flying blind. Five, theme compatibility and support quality. Read the three-star reviews. Five-star reviews tell you what the vendor wants you to hear. Three-star reviews tell you what you will actually deal with.
Six, pricing math. Most AR ecommerce plugin SaaS tools charge per model, per month, or per view. Model your SKU count and traffic against the plan before falling in love with the demo.
Get those six right and an AR Shopify plugin app is a perfectly good route. Get them wrong and it is an expensive widget nobody taps. One more from experience: install it on a staging theme first and click through the whole flow as a shopper would. Demos lie by omission. Your own checkout flow does not.
Want a second opinion before you install? I consult e-commerce brands on AR implementation at arcommerce.fyi.