They're not bad. Found them similar to Ader kettlebells.
My best friend's father has a saying about road-bikes: "you can have a $200 bike or a $20,000 bike...you still have to pedal it"
and I tend to use this attitude towards other fitness equipment like kettlebells.
No matter how fancy it may appear, it ain't gonna swing itself.
Find one (or two) that fit your budget, and swing away. I personally feel that there may be better deals out there for better quality, but that's just me. And I find the Onnit bells don't hold chalk very well