Pre-purchase upsells we have seen a 35-40% uptake (we offer a past box or a book) and the high-ticket post-purchase upsell sees about a 5-15% uptake which is great! AOV has increased by $15,
I got about 25-30% conversion of that upsell offer for new sign-ups I think
This works really well and my average order is over $100 because of the upsells/post-purchase options