Ebay parts

Hi Guys,
Has anyone bought any of these parts? Are they worth the saving? I most concerned about the timing chain since that means opening up the front block. Please advise....

http://www.ebay.com.au/itm/Nissan-Na...-/252041096399

http://www.ebay.com.au/itm/Timing-be...item1c51955dd8

Do you have any options that I can buy/source?

Personally I would never put an after market timing chain on any engine. If it fails your cactus.
Not so sure about belt but a lot of peps on this forum have had issues with after market tensioners.

Thanks for the advise. I guess the saving of $200 on both the parts may not be worth it after all.
Any suggestions for a good parts vendor in Sydney (besides Nissan)?