I can't make a comparison, but I do have the Nissin for my Nikon and it does a great job - especially when you consider the features VS price difference of the Nikon/Cannon speedlight. I'd consider myself at the top end of beginner in terms of skill and I can't see myself needing to upgrade it anytime soon. Of course, this depends on if you want to do fancier lighting stuff putting flashes into groups and controlling them all remotely etc.
On camera it is flawless, the flash trigger (the Nissin flashes when it detects the on-camera flash) seems to work very well and I also use it with some cheapo eBay remote triggers no problem.
In conclusion, I give the Nissin a thumbs up!