We had Select Sunrooms install a 3 season sunroom on the south side of our house in June of 2009. We have been very impressed with Select Sunrooms, the installation took a week very quick and professional. A month later we discovered a leak they came out and repaired it right away. We found another leak almost 2 years later we phoned them and Fred was out to look at it that day.
We use the sunroom a lot even in winter if the sun is bright it will get up to 70 or 80 degrees, my wife loved to sit in the sun with a cup of tea watching the partridge play in the snow.
I would highly recommend Select Sunrooms if you are planning to have one installed.