I've used BioSafe a couple of times.
I have no doubt that it is as accurate as whatever is used by my own HMO. All the values were either exactly the same as my HMO results or were in the range indicated by a third test source (health fair). If you shop around on the Net you can get em for around 28 bucks per panel.
(Also the kit makes a great gift for someone whose health you care about

)