We have been using Mobilitye ecommerce from one year and during this time we have managed to connect all my eCommerce place and we are very satisfied with the services. We no longer have fears of overselling, out of stock, price management, no mix-up etc. The price and service I think best in the market and his account manager is always available to contact if we need something new or something fixing. They also provided NetSutie integration for my eBay and amazon business and we have almost doubled our sales after the integration.
Apart from the services they also give free advice for selling and product listed related issues. I can bet you you won't get such kind of services from any company.