Hour Passion is essentially an outlet store for the Swatch group, and I've been wanting to visit…read morefor a while. On my most recent Vegas trip, I stopped in mid-week, and it was nice and quiet. A nice salesperson helped me out (don't remember her name), and I ended up purchasing a 39mm Hamilton Khaki Pilot for just over $600 out the door (crazy inexpensive), with a full manufacturer's warranty (box and papers), which I absolutely love.
They have Longines, Tissot, Mido, Hamilton, Rado, and other Swatch brands, with a wide selection. Honestly, I could have spent hours in there trying on watches. The watches are marked down anywhere from ~35% to 50% off what you'd pay at an AD, and if you're lucky, they have brand-new, unworn ones in their cases (like mine).
They don't have all the latest models and sizes (some MIDOs I wanted to try on weren't there), but you're bound to find something you'll like at an unbelievable discount. There are only two Hour Passions in the United States, so I definitely plan to visit on my next Vegas trip!