So, for the past 3 to 4 months, I've been researching, diligently various types of saunas.  You know me :o/  Once I'm set on something, there's a 90% chance I'm going to follow thru once I've made up my mind.  Of course, with hubby's acknowledgment, approval and consent :o) (If you envision something long enough, eventually it will come true...Right?)
As always, I don't usually go with the most expensive or the cheapest.  I'm not inclined to buy something because of it's name, but still want quality and a lifetime warranty from a reputable company.  It actually took less than a week to receive our sauna and according to hubby, less than an hour and a half to install.  I decided to go with 
West Coast Saunas due to the fact their saunas are carbon based; it's heat therapy with Carbon Wave 360.  It allows for up to 3X the sweat volume produced compared to a traditional sauna without feeling overly hot, and has the ability to penetrate deep into the subcutaneous tissues of your body for greater healing. 
Here are some stats I found to be interesting on Far-Infrared Saunas.  This list is not all inclusive:
Detoxifies - 7x more effective at detoxifying metals as well as cholesterol, nicotine, alcohol, ammonia, sulfuric acid and other environmental toxins.
Increases Blood Flow - expands capillaries in the body, which stimulates increased blood flow, circulation, and oxygenation.
Increases Metabolism - burns calories by increasing your metabolism and core temperature.  Also breaks down cellulite, trapped water and fat.
Relaxes Muscles - reduces soreness on nerve endings and muscle spasms as joints and fibers are heated.  Great for fibromyalgia and arthritis.
Immune System - raises internal body temperature, inducing an artificial fever.  Fever is the body's natural mechnaism to strengthen the immune response.
I believe there are at least 100 benefits utilizing infrared heat; there are many therapeutic properties that have been well documented. 
The Malibu sauna also comes with 
Chromotherapy.  Light therapy is another facet of healing.  Currently, I like to use purple for my allergies and sinuses.  Purple is also popular in glass stained windows you see often in churches.  With the system I have, you can have all the colors rotate in order to benefit from all the colors.
Overall, I am really pleased and in a week's time have seen great improvement with my post nasal drip (secondary to all my allergies) and the texture of my skin.  
There's a lot more I have not even touched, however I like to keep my posts short.  If you have a particular question, please do not hesitate to ask.  I'll be more than happy to provide my feedback and/or comments.