The website was slow
The website was slow, and as a result, cumbersome to use. There are multiple times where the page is loading but there is no user feedback that things are happening in the background. This makes one feel like the website is no longer working. In some cases, the website actually did stop working. I used both Google Chrome and Mozilla Firefox, in both web and mobile. As an example, on web Google Chrome works much better than Firefox. On mobile, however, I couldn't even tap to log in when using Chrome. I used Firefox on mobile and it allowed me to sign in and ultimately purchase the product.
I didn't have any exposure to the support team, so I can't comment there.
I really liked that there were clear dimensions for the products. The latter made my purchase decision become more confident.