Here's a sample of what a No Coating - Standard Gloss piece looks like versus a UV Coated piece.  UV Coating provides a much brighter high gloss finish and gives your piece an overall feeling of greater quality.

Benefits of UV Coating
There are several benefits that print buyers and designers can derive from using UV Coating.  For example:

It is a rush job. Since UV inks dry so quickly on- or off-press, you can get a faster turnaround on a job than conventional inks.
You are using uncoated stock and want a crisp look to the text and graphics. Conventional inks sink into uncoated stock, but UV inks are cured within seconds on press, so they don't have time to settle into the stock.
You are using coated stock and want a super glossy finish. UV inks give you this look on coated stock.
You want to control the amount of smudging and abrasion. Since UV inks flash-dry on press, they resist smudging and scrapes more than conventional inks, which remain a bit soft after printing.

Benefits of No Coating - Standard Gloss
Some benefits that print buyers and designers can derive from using No Coating - Standard Gloss are:

Ability to write on the piece with a ballpoint pen or pencil.
Ability to inkjet addresses on the piece for direct mailing.