I've used the roid test kit as my friend has it, it works and tells you if your gear is legit but doesn't tell you how much is in it, some gear on the market is fake but lots are under dosed and that's the real problem
And it's not Dave's actual kit, he's just a reseller, the kit is made by William Llewellyn, Dave sells it a bit cheaper than the official website but I don't know what Dave's return/refund policy is, at least with the official website you have more guarantees
Another thing, as this isn't really to defend Dave but the diet thing were he gave many people the same diet is kinda misleading, he gave everyone the same diet to start with then adjusted the diet/macros as the weeks go by from progress pics, weight, bf % etc
He can't give you a custom diet with specific macros from week 1 if he doesn't know how you would react or how fast or slow your metabolism is, remember everyone is different and it takes time to see how someone really reacts