Here is the analysis by one of the 4 witnesses, Dave Kennedy. It’s a 19 page document. He will be on Greta tonight at 7pm.
https://www.trustedsec.com/files/CONGRESS_Hearing_HealthCareSEC_FINAL_v1.1.pdf
Let me sum up this PDF for those without the time / technical background to read and understand what’s being said:
If you value your identity, stay off Healthcare.gov