Pros: Excellent hardware by Apple despite being dated (2006 in my case)
Good price - $400 for Mac Pro (2006 server) with {only} 2 GB DDR2 RAM (but upgradable to 16GB); 2.66 Quad Core Intel cpu; after increasing RAM memory, one can upgrade the OS X to Snow Leopard or Mavericks if desired though I do not recommend it.

Cons: NOT REFURBISHED AT ALL: this company does absolutely nothing to ensure that the product is working properly. Dust, food, dirt found inside the machine and usually the company (Mammal Solutions) does not verify if the unit promised in their ads is the same as the one that they ship out. In my case they refunded a portion of the price I paid as a consolation but be careful

Other Thoughts: Make sure that the unit promised is what you are getting BEFORE you buy.

Pros: Computer looks really good, didnt have any scuffs or anything. Fast!!! I was always wanting a Mac Pro, even though this one is a bit older, it doesn't disappoint at all.

Cons: It shows under under specs that the unit ships with a Nvidia 7300 GT, mine unfortunately came with a x1900. But it really isn't a big deal since I plan on putting a better Graphics card in it anyway, so it really isn't a con. But the unit they shipped to me, inside did have a few dust pieces in it....