Submitting passport through VFS Ahmedabad.
I have just submitted passports ( along with Spouse and dependent) through VFS ahmedabad.
Just few things to keep in mind.
Either go early in the morning (9:00 am) or prefer to submit after 12:00 PM due to agents.
Each agent having lots of file and it will take huge amount of time. So, you need to wait for a longer period.
You dont need authorisation letter for your spouse. Out of two photo, you need to write your name and DOB on the back side of one photo.
I have not opted SMS service and it cost me INR 1737 for 3 passports.
When you go for pick up the passport/s, you need to show Passport copy or any other government authorise document for each member. They said it will take 7-12 working days of stamping. And yes, they are not working on Saturday.
Hope this help and let me know for more information.