The Dragon Knock is pretty bland. I only use it because I paid for it. As soon as I buy another one it's going in the the trash.
Trust me don't get the cheap ones. Most of the time they're terrible. Not all of the cheap ones are bad though.
My first onaholes were these:http://www.jlist.com/product/OMO507http://www.jlist.com/product/AO206
Both of these were great. I can say they're way better than the dragon crap. I also got Doctor anal which is even worse than the dragon.
Lesson that I've learned so far with these is that you should never ever go for the super soft onaholes. I actually only bought Doctor Anal and Dragon Knock because they could be turned inside out for "easier cleaning". It's not easier cleaning. It's actually more work.
Learn from me don't get them. Dont get tenga stuff either. You'll want something with lasting power.