Initially we started out with high expectations when using Channel Advisor. A lot of that was due to them promising us pretty much everything we asked of them, We started to learn as our campaign wore on that they tend to over-promise and under deliver. This is in direct contradiction to what our business mantra is, which is to UNDER promise and over deliver.
Another area of recent disappointment: customer service. It started out decent, but has since dissolved into utter uselessness. Seems we either speak to someone who has no idea what they are talking about, or someone that just has no interest in helping at all.