The most helpful part of synccentric has been using its API toolkit for my clients' websites, allowing me access in real time with analytics to see where products are selling well or poorly from site-to-site within sites like amazon. I've had positive experiences working w/the team at Synccentric but also some challenges when trying new things which might be due more towards our inexperience than anything else (i'd say).
They're very quick about responding back & helping out! Overall it's worth