Nothing wrong with Amazon. But if you're new to researching for camera gear specifically , the two big dogs in the on-line fight are Adorama and B&H.
I am a Prime member (free 2 day shipping) of Amazon, so I buy lots of stuff from Amazon, more other stuff than camera gear but I have bought lenses from them.
It is not Amazon I worry about with lenses it is the carrier, ups/fedex.
Old story but the carriers don't care if you have a $5000 lens in the box, it's still tossed around like a it's a boxed basketball.
Adorama and B & h use the same carriers, so good luck and open the box in front of the driver if the box appears damaged, so you can refuse it and he can take it back if it is .
My point being, Pack your **** right. That' the only issue. They don't treat everything with care ofcourse not that would take way too much time. They want the package in and out as fast as possible therefore more business. UPS is a great Courrier.