I just had a therma tru fiberglass door installed by a local building company a few months ago and a storm door as well. It was more expensive than the big box store, but I love it. it wasn't something I could do myself, and knew it wasn't going to be changed any time soon so I felt the extra cost was justified.
I had the door painted by the manufacturer for a minimal cost as well. Info I was given by many was to NOT use the big box company for installation since hanging a door isn't for a novice. As they often have frequent turnover and also contract out you want to be sure someone with experience does the installation.
My 2 guys were awesome, they'd worked together for decades and hardly spoke to one another they knew their craft so well and anticipated each other's next move.
Good luck
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