When you think this is costing me around £35 a month - its a bargain and a great tool considering its really boosting my sales. I sell a number of products that are constantly changing price due to competitors dropping their price by a matter of pence. I used to only have time to go into the seller central and reprice my items once in a while - now I have SellerExpress constantly doing it for me. I have a '24/7 full time employee' for very little cost per month!
Its worth it for this tool alone but also has lots of other handy features - things you cant do on Amazons seller central.
The support has been really very good, they are patient and will speak to you on the phone if need be.