I just had my new mouse replaced under warranty by PBT.
It failed after about 3 weeks - the centre wheel ratchet just went AWOL.
I had no problem getting an RMA and returning it, and a new one turned up today, 5 days or so after returning the broken one, so no complaints there at all.
I was curious to note that the tax invoice included with the replacement states as follows
"#Warranty Policy: Warranty will not be renewed."
Anyone know what they mean by that?