There's no arguing that the WRSI is much cheaper than the Sweet Rocker, and it provides the same amount of impact absorption (if not more). The issue with me was fit. The WRSI seems to sit on top of the head and isn't quite as secure as the head hugging Rocker.
I own both, and recently cracked the Rocker so I got to wear the WRSI for a bit and compare my experiences in both. The WRSI is virtually indestructible, so it's a bargain of a helmet. If it fits your head snugly go for it, otherwise the Rocker might be the way to go. And of course I'm leaving looks out of this.
I have a Sweet Strutter and Rocker and I love them both. That being said I have also cracked them both. That being said I am still here with no brain damage beyond what I had coming into the sport and they are the most comfortable helmets out there. That being said I probably won't buy another until they sponsor me cause they ain't cheap. That being said my next helmet will probably be the WRSI.
Another consideration would be warranty. I mentioned the WRSI is hard to break, so that may not be a big issue. But be reassured that Sweet is on their game with customer service. I contacted them and was able to get a warranty Rocker, even a size up at my request. You might not get the same story with other manufacturers. Read more about the Sweet Rocker warranty on my blog