Hi there,
I'm quite happy with wp-estore but a couple of people have emailed me that the wrong product gets added to the cart when they try to buy something.
You can try it out here: http://bit.ly/l41C2w (sorry for shortening it, I don't want google to index this)
People told me they tried to buy the "Standard-Version" (which is 19€, first "add to cart" button on the page) and ended up seeing the "Premium-Version" (which is 29€, second "add to cart" button on the page) in the cart.
Now I can't recreate that exact problem but looking at my emails I feel like about 5-10% of my users are afflicted, so it's definitely there.
I have the impression that most of these users might use Internet Explorer and not Firefox, but I can't vouch for that.
I disabled all caching plugins although I didn't even use WP Super Cache etc.
I also do use WP Affiliate Platform but I don't think this should be a problem.
Any help is appreciated!
Thanks!