I'm no expert but have just ordered my first ever mincer/grinder.
In all my weeks of research & trawling the web I never came across Uniworld.
I did some online research for you and it seems they are a US based 'importer/manufacturer', although I suspect that's jargon for 'importer'.
I'd imaging they buy container loads of variable quality items quite cheaply from China/India/South America and put a healthy mark-up on top after re-branding it as their own and sell it to people looking for a 'bargain' or distribute in certain parts of the US where they have sales agents.
Here's their website if you want to check them out.
http://uniworldfoodequipments.com/
My personal view: I steered clear of a similar product which I saw on eBay which initially looked great. It was marketed by someone who was obviously working from home with a garage full of the things (the pictures were in someone's garden) but were sold as commercial grade.
On digging around I found these were made in China and distributed by half the chinese people on AliBaba.com.
I ended up ordering a Buffalo CD400 which seems to be a bonafide pro grinder (although a lower end model) and since all the UK catering wholesalers sell a range of Buffalo goods from electrical goods to ovens I felt that they were reputable.
Then again I seem to try to buy things that are better than I need, don't know why, it's just my character.
If you prefer the money to spend on something else, or prefer to 'make do' with a cheaper version of what basically just mashes up meat, then take a punt and buy one (I assume they're low priced). If it breaks, toss it in the bin and order another one!
Good luck whatever you choose to do!