The ability of having multiple options at checkout like coupons as well! It was very helpful when I first started using it because my customer service team kept me updated throughout each step while creating their account which helped ease any concerns or questions i had along way!! Nothing really but we are always improving our services so far its been great working through this transition together. They do offer many different methods such as coupon codes etc., not only does click ship help keep track all these discounts they also provide some pretty decent incentives if someone uses them often enough over time by offering special deals just from signing up again after 6 months (if thats what works best).