Looks pretty horrible to me. Toyota designers spent a lot of time designing the front end, and making sure everything is very visually balanced. When I look at the photos on the site, it just looks very cheap and tacky.
T-Rex actually makes a pretty nice product. The only problem with the 4Runner ones is that they are "overlays". You can still see the factory honeycomb grill behind it. It's best to find a company that requires cutting the factory grill.