It's a decent start. I think the 5th Gen Alpine is just a bit flat compared to the 4th Gen, IMHO. So I swapped out the front dash corners and it woke up enough for me to be extremely happy. I would also consider myself an amateur audiophile and the corners were the ticket for my ears. Other than that, I have no issue with the Alpine setup.
To answer your question directly, I would say the advantage is having all the logistical work done, Amp, wires to each speaker location, etc. All you have to do is swap whatever drivers don't pass the test.