I am satisfied, but there are issues.
The problem is that this is without a doubt a cheap flash and you must make sure the flash is securely fastened to the camera shoe. It's not like a 580EX where you slap it on, flick the lever and you're good.
Once it's on though it does well but there's no FEC on flash. The diffuser works well and the bounce card is great, a bit larger than the Canon version.
My thoughts are that if you want a good on camera flash, go with Canon or Metz. Hands down. You want a good flash to supplement your strobist kit? The Vivitar 383 is a great option although again in my opinion, if you can stick with all Canon, do it. If you want to save some money then there are good options.