Add-On Products - Some Quirks

I've just seen the new feature that allows you to upsell "add-on" products on product pages. This is a nice feature, but in trying to use it I've found some quirks. So if you're going to try this out, here's a few things I've noticed:

When you add an add-on product, it will only display a thumbnail if you have explicitly set a thumbnail in the product you wish to add-on. Generally I don't bother setting thumbnails explicitly as they are not really used within any feature I personally have on my store. However, for add-on products you'll only get a thumbnail displayed if you have explicitly set one (it won't just use the first image for example)

When adding an add-on product in the editor, for some reason, it's only showing a small selection of the products in my store as options. This isn't because of restrictions (which I'll come on to), it just doesn't seem to show all the valid products. If you have the same issue, I've found that opening the product you want to add-on in the editor and then saving it again makes it magically appear as an option when you try again. So some kind of glitch there at the moment.

You can't add-on any products that have variants, and you can't set a quantity of products for each add-on. This is the main thing that makes this a much less useful feature for my particular store, but I appreciate it may be less of an issue for other people. It would have been nice to have been able to set a default quantity for example. In my store's case we sell sewing patterns. We also have products that you'll need for a given project, so for example the pattern might require X metres of product Y, or perhaps it needs 3 buttons, and so on. So without being able to set default quantities (add 3 buttons), it's not that useful to us, which is a shame, as it would be great to allow customers to add all the products they need for the project via these simple add-on buttons. I could create a separate product that's (for example) a pack of 3 buttons, but (a) this makes stock management a pain and (b) I'd need to create lots of separate products for N meters of each type of fabric, interfacing, elastic, and so, which isn't really practical and would bloat the store page unnecessarily. It's also just a fix for the quantity issue, the variants have a similar problem, it would be great for customers to be able to select the colour they want for an add-on item, for example.

So, a couple of glitchy things and some limitations. Overall I'm glad to see Squarespace adding features like this, as upsell in particular hasn't been very strong to date (I'm not sure these add-ons appear on the cart page either). I don't want this post to come across as moaning, as I'm sure this feature is going to be great for lots of people, it's just not a great fit for my particular store. I'm going to be primarily sticking with my current solution which is to have a summary block in the additional info section that lists related products with a quick view option. This provides a more suitable solution for my needs as the customer can select quantity and colour variants. I do love the impulse nature of the add-on buttons though, so I'll be using them in the few places where it makes sense.

Would be interesting to hear other people's experiences and if they've got any nice work arounds for the current limitations.