Loading the cart takes a painfully long time, both on Wifi and LTE. If the cart even loads, and I decide I want to remove an item from my cart, it restarts the whole process. It seems that this issue exists on the mobile website as well (using Safari).
Also, it would be wise to turn product images within the cart into links to product pages so I can compare items in my cart (since Im often told Im unable to add items to a Quick List).
In short, look at what Amazon is doing with their Wish Lists and Shopping Cart - and copy that.
sbtokarz about Lowe's Home Improvement, v4.1.1