I used metalgear ones on my old CBR, but that was a 250. They were quite expensive.
The few reports of the eBay ones I've read seem fine. I haven't heard of failures or premature wear.
I've got metalgear discs on my 636, and they've been fine; no warpage at all after despite using them hard at the track.
METALGEAR braking products are world class.
They meet just about every local and international quality standard.
They guarantee their products 100%.
They are an Australian company.
They are DELIGHTFULLY friendly, efficient and professional in all aspects of their business dealings.
If something goes wrong with your brakes and the worst happens, who will you (or your family, or the coroner) hold accountable?
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Sometimes I feel like Rock trying to explain to Scissors why Paper always wins.