Is buying parts on Amazon a good idea?

Looking to upgrade my 2005 Dyna Low Rider FXDLI with a new cam chest kit, and hoping to save some money buying the kit on Amazon.

I was originally just going to switch out the cam chain tensioners and inner cam bearings (which I've read are especially weak points in 05- Twin Cams) with Feuling's cam plate kit, but I figured new cams, lifters, and adj. pushrods were a better investment since I'm going to be paying for the labor anyway. The estimate I got for the Feuling cam plate kit totaled out to be around 700 for the part and 500 for the labor, which seems fair.

Kit in question: https://www.sscycle.com/products/easy-start-chain-drive-cam-chest-kit-for-1999-06-hd-big-twin-except-06-dyna-585ce/

Amazon link: https://www.amazon.com/Cycle-585CE-Start-Chain-330-0543/dp/B071L5M379

Here is the set I was originally going to get: http://www.feulingparts.com/sku/7090

Anyone have any experience with this or Ebay? Thoughts and suggestions would be greatly appreciated. Thanks.