I do believe that scotus blew it on this one.
Their source is too anonymous and so is who manages them and who is accountable for what they release. This can lead to abuse and I believe it already has. There seems to be no vetting process to verify what is fact or fiction in their ads and nor is there any way to know if some are intentionally deceptive.
The worst part, IMO, is that candidates can too easily separate themselves from PAC generated ads that produce backlash or negative press. Disclaimers and apologies are about all they can make but the damage is already done and the voting population short changed. I would like to see them gone.