"It's worth noting that the RidV study only included results for volunteers who completed testing with all five vendors, which the GSA said might mean error rates could be higher if users dropped out due to frustration. Performance for fraud detection also wasn't tested as part of the study."
Holy selection bias batman! This right here pretty much invalidates the study anyway. Especially the first bit. I can't find it right now, but is there any reported number on how many people started and then stopped midway through? I'd imagine the "best" might actually be the worst if all the people for whom it doesn't work have just given up and only those who can reliably make it through the testing (ie, the only ones who can make it work) stay in the study.