There's nothing wrong with the Ferret 50, they've won plenty of matches in FCSA sanctioned matches.
As far as safety goes, a few years back another manufacturer of .50 BMG uppers had an out of battery kaboom. This led to people looking for the reason because no one wanted it to happen to them. Only ONE manufacturer could claim that their uppers were safe and didn't need to be updated, that was Spider Firearms a.k.a. Ferret 50!
I know someone that deals with Dave every now and then and he said that Dave was having some health issues. He said that he's back on his feet and doing all he can to catch up, take it with a grain of salt.
If anyone is looking for a Ferret 50 upper, used, only has 60 rounds thru it, PM me.