We selected Channel Advisor to help grow our presence on Amazon and to add the Walmart and Jet channels. We found very little added value with the Channel Advisor interface over the stock Amazon, Walmart and Jet interfaces, particularly for the cost of the platform. Channel Advisor support was weak - once we signed the contract that was the last we heard from them other than quarterly billings. We found it to be difficult to actually speak or communicate with anyone if you did have questions. We received no notification when our annual renewal came around, just a big hike in fees.
Unfortunately our experience was a huge waste of money. Would not recommend Channel Advisor.