The best part about this tool was it helped us increase conversions from cold calls into qualified leads which eventually became clients - thereby increasing overall revenues without investing heavily or hiring additional resources! There were no downsides at all as far we could see but I'm sure there must be some that they have yet not disclosed publicly so can't comment further than what's publically available now (which isnot much).
We hired them initially because their website looked good & promised great ROI with minimal investment required compared to other similar services out therse like Zuora etc. They did promise more features would come soon later downthe line alongwith pricing changes too though both never happened till date probably due high competition among providers offering almost identical offerings nowadays :(.