In my local area Corsair RM750x
cost 136.89€ while Chieftec Polaris
cost 78.79€ witch makes it one of the best price and performance ratios here. In Lithuania the closest competitor from Corsair side is CV 650 witch
cost 61.59€ (750W version doesn't exists that is why I am comparing with 650W version). I think that in this case Chieftec Polaris is much better choice that Corsair CV series. And honestly I can't see any better 750W PSU in price range up to 80€.
I know that two years warranty is the biggest Chieftec problem. But since they are usually offering the best performance for the price it is OK for me. I believe that for the same price is much better to choose Chieftec with good performance and 2 years warranty instead of poor/average performance PSU with 5 years warranty. That is why if it is needed to offer power supply from 30€ to 100€, usually I recommend to choose Chieftec.