Having the windows tinted at your home has many many benefits.

Privacy, gain daytime privacy (like net curtains offer) with a tinted film, but have much better vision out than net curtains offer.

Solar control, reduce heat inside the house (particularly conservatory's) by reflecting the heat back out using a reflective film.

Reduce glare (to enable you to watch the tv or use a computer more easily when its sunny)

Reduce UV damage (fading) to interior furnishings and carpets etc.

Gain total privacy with a frosted or etched look film but still let all the light in. (ideal for bathrooms/wc)

Gain security with a safety film (clear or tinted), turns a standard window into toughened glass specification or all the way up to bullet proof specification.