Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Not what I expected from Bosch

I bought these to replace the OEM wipers on my 2010 Infiniti G37x. They worked well for about 2 months, and then started streaking. I tried cleaning them (and the windshield), but they just continued to degrade. When I went in for service (4 months after installation), I was told I needed new wipers. These are supposed to be covered by a warranty - I tried to get get in touch with Bosch's warranty department for 6 weeks - I am still waiting for a callback. I'll buy a new set from a different brand, but this is not what I expected from a "premium" mark. Won't buy again.