I've had Kinetix discs with Brembo pads fitted to the front for a month now (on my daily driver) and have no complaints at all.
Mine were also bought from eBay and as Bob said, was a bit of a gamble as there wasn't much feedback from Zed owners that had fitted them. They are very keenly priced, dimpled and grooved discs, made in the UK.
In summary - so far, so very good