I bought a 20kg and it swings great. While the handle may seem slick, I haven't had and issues with it slipping. Granted, I have had it for less than two months, it definitely gets the job done. It was nice not to fork over a bunch of money.Wow that's cheap, but what about their quality? This decision would depend on your training volume.
IMO a quality kettlebell is a long term investment. I have trained hard with cheap bells and the wear and tear on my hands was not worth it.
If you want a precision machined and balanced bell with free shipping take a look at KettlebellsUSA.com.