There is a small formatting issue on order confirm mail template (template/mail/order_confirm.tpl). It has existed on the first version I downloaded (1.1.9) and still exists today.
While it does not detract in any way to this wonderful shipping cart application, it is visible to every one of our customers. I fix it every time I upgrade, so I thought it worth mentioning and maybe it can get fixed.
If you look at the order confirmation email the customer gets, the top of the Model column does not align with the rest of the row. This is because it does not have the same style settings as the rest of the rows. Simple fix: add width: 15%; padding: 0.3em; to the style attribute to match the other columns.
Good to go.
Don