Well, the profitability will be near to the predicted by the websites given that the price of the coin you're mining remains relatively constant to its current.
Anyway, ASICs have always been a risky purchase as there is no utility for it other then mining specific algorithm coins. Still, if you want to proceed with it. I'll strongly suggest purchasing it directly from the manufacturer's website, no matter what the third party sites says. If they have positive reviews from the reputable members of the community then it is safe to make a purchase from the site but until you get more information, it's better to stick with known websites to purchase ASICs.