Seen plenty of appalling reviews.
It is very unfortunate that Corsair named the Builder Series CX. That aside, basically it is intended to be a cheaper alternative that will do as the label says and won't fail due to load. That can't be said about all cheap PSUs. See reviews of Diablotek, Apevia, etc.
Most of the "appalling reviews" are Newegg user reviews, and seriously many of them are completely bogus. Out of the thirteen single Egg reviews, one reviewer never used it because it didn't pass a "test" using a "power supply tester." Uh huh. We know how well those things work. Then, there were a total of FOUR single Egg "reviews" from people who just wanted to ding Corsair for "putting out crap."
The jonnyGURU review proved for a fact that the CX430 actually was around 80% efficient (though not 80Plus certified) and can actually do what the label claims (28A +12v, 430W @30°C).
Regarding pricing, the CX430 has a lower MSRP than all the PSUs commonly named as better alternatives, the Corsair CX400, Antec NEO ECO 400C, Rosewill Green RG430 and Antec EarthWatts Green EA-380D. But, but, but, those other PSUs go on sale or have rebates, right? Well, so can the CX430. Basically the CX430 averages around 20% less cost than the other PSUs.
Corsair is not going to resurrect the CX400. Nobody wanted to buy it. "Wait," you say, "everybody bought them and loved them." Let me rephrase: Nobody wanted to buy them at a price that Corsair needed to sell them at. It was very obvious to Corsair that there is a market for under-$50 PSUs, so they found a PSU that they can sell in that price range that isn't "crap."
I was the one that purchased the CX430 (from Newegg) for the review. I bought it as a cheap spare, and thought that a real review (complete with load test and 'scope) would be interesting, since all the "enthusiasts" were crying foul over just the mere existence of it. In conversing with jonnyGURU, he agreed with me that an independent test would be very enlightening. I thus agreed to hand over my brand new and still shrink-wrapped unit for testing.
Interestingly while Corsair refused to (and still does) send out review units, they were REALLY QUICK in slapping a "jonnyGURU.com recommended" label on the CX430 description at Newegg.
Disclaimer: I am not affiliated with jonnyGURU.com (beyond being a forum member there) nor with Corsair (beyond owning a number of Corsair branded items) in any way.