Have got four pairs of them from 160 to 203, no problems with any of them apart from a tiny bit of Shimano caliper shing shing with one of the 180s easily remedied with a few strokes of a flat file.
In fact despite all the haterz they’ve been amazingly good no rattles or dodgy anodising or warping they’ve been fit and forget. In terms of weight they are within a few grammes of same-size RT76s. As with most Superstar kit they are made to a cost (think Deore) and if I was lucky enough to have some Tech 3s I don’t think I’d besmirch them with such workmanlike rotors but hey if you want to save a few quid and you spend more time riding than you do looking at your rotors then go for it.