We have built Contact Washing Machines (CWMs) for some of our customers. Reachforce, Data.com are good for lead enrichment, whereas Ringlead is good for preventing duplicate records. However, we discovered a common challenge for many marketing ops team, and that is assessing the quality of existing data, and cleaning/enriching that. So, our solution helped teams in data cleansing, normalization and then finally enriching the existing as well as new data.
Drop me a line at rachitp@grazitti.com and I will share the case study with you for our CWM.