many on here will say that they are not as good - and they are likely not as good, but that does not mean they will not do the same job. If you are a professional and going to be using them every day, every hour, and over and over again, chances are they will not hold up as well. They may not be constructed with the same degree of specifications as the snap on and may (MAY) round fasteners - but I doubt it.
You spent more money on your sockets, but will get better service (hopefully), and they are warrantied for life, will not round fasteners (if used properly) and they'll look nicer in your tool box.
Snapon tools are more expensive, but generally you get what you pay for, some things are over priced and I would go to a house brand name, but sockets, extensions, ratchets, wrenches, and some other things I wouldn't buy any other name.
When I bought my first "new" set of impact sockets, I went with Grey Pneumatic (similar to Sunex) and plan to replace them with Snapon or MAC when they ware...all depends on your finances, and your plans of how/what you want to do with your tools.