Well, on the plus side, they offer larger diameter glass implants than DT, and they clearly outperform smaller implants. Also, their implants are coated, which I prefer - but I’m in a minority apparently.
On the minus side, their website is light on technical details and the company’s owner won’t answer emails. They don’t have a vibrant community like DT (they don’t have a community at all in fact). Also, apparently there have been reports of glass implants from them being fragile and breaking. And they are known to offer products of questionable quality.
In short, I am happy with my own IAR implants. Would I buy from them again? Possibly, if it’s a glass tube and I’m looking for extra range, or if it’s an implant I want to stick somewhere odd and be extra-sure it’ll stay put. Should you? Probably not.
(Incidentally, I really wish DT offered a coating option. Hint hint nudge nudge 
)