It really depends on a lot of factors. How many people live in the house, what is the layout like, how secure is the rest of the house, how close are the neighbors, etc. I would consider it only if I lived alone and the front door lock was the weakest point of entry in the house (which in most homes it isn't). If there are other people in the house, especially kids, the key will likely be left in the lock making it no more secure than a regular deadbolt, or the key will get misplaced causing more of an inconvienece than anything else. There is also the fire aspect to worry about, but unless that door is the only exit and there are no other escape routes nearby it isn't a huge concern for me.

I don't know how much security it would add to a normal house. Tempered glass is a lot harder to break than people think, and I suspect most burgalars would choose an easier and less exposed point of entry than the front door. Do you have any ground level windows? A back patio door? Are the door frames reinforced? All it would take is a swift kick to the door to break the door jamb, which would be a lot quicker than breaking the door window. If it were a back door that was out of sight from the neighbors and there were no other vulnerable entry points nearby I might consider it.