R values of fiberglass doors can be significantly higher than wood (if they incorporate a foam layer), which can be very important depending on climate. Some of the better ones look pretty decent, rather than having "the look of real wood".

I have a fiber glass door, Therma-tru. It came with wood grain appearance, and I stained it. It is my north facing front door. It opens to a covered porch and has a storm door, so no problems with weather and no problems with heat. Several contractors who have come to the house have thought it was wood and complimented its appearance. I am very happy with it for what it's worth.

Abbey

My door will be facing South. And the house is in Chicago North Burbs.

Hi Donchik, I am also in the Chgo burbs (NW).

While some fiberglass doors were beautiful to look at, they felt like plastic.

When I knocked on the fiberglass door - it sold me on replacing my wood door with another wood door.

There are some good fakes, but, if you have an eye for detail, you can't mistake a fiberglass door for wood in my opinion. I don't like my house to look like it's made of plastic, so I won't use it for doors or siding.

I went with fiberglass on two of our new doors. While the locations are covered they are most susceptible to blowing rain. We have painted them red. Kind of a burgundy color and we are very pleased with them. The front dorr, which is fully under cover is Burmese Teak. A friend built it and it is beautiful. Surprisingly, while I would always vote for wood doors, I saved a bit of money with the FG and they look fine and they are more stable. It's about the only place I can say that in this re-model;)