I like how everyone in this thread discounts these turbos having never installed one, used one, or hell even had a turbo on their car.
Simple fact is, Ebay turbos are pretty darn functional, they commonly use a lot of great parts such as OEM garrett thrust bearings, shafts, etc. The only thing that may not be up to speed with these turbos at times is the somewhat shotty compressor/exhaust wheel balancing, which could be checked a turbo shop easily enough if you were paranoid.
I have a GT45 clone off ebay on the shelf, a friend of mine went 8's at 150 with this turbo, it was around $300 vs $2700 for a garrett turbo.