I did the front door speaker install this morning. I always move slower and am very careful when dealing with interior parts because they're generally easy to break and expensive to replace, so it took me 30 minutes per side. I will say that the difference in 40Hz-2k is MUCH better than the stock chinese speakers (I don't think they're actually alpine speakers). I don't see much of a reduction in loudness since the new speakers' effective ohm rating matches and sensitivity is pretty high.
Note to anyone doing this mod: Either re-use the siliconeish sealant from the stock speakers, or use some type of sealant on the new ones. I washed my truck yesterday afternoon, and found water jammed up against the bottom of both speakers' sealant gaskets. Reusing was easy, I just carefully rolled the sealant/gasket little sections at a time from the magnet side outward and transferred it to the new speakers.
Comparison front:
Comparison rear:
Sealant on stock speaker:
Closeup of sealant:
How I rolled sealant off from magnet side outward for re-use:
Sealant removed:
Sealant on new speaker:
Water pooled at bottom of speaker (water was also pushed into the inside edge of the gasket):
Finished result. Look at that beautiful carbon fiber cone: