The Printspace was recommended to me ... and they blow the competition out of the water. Don't believe the 48-hour turnaround story - more like 48 minutes if you pick the right time of day (which seems to be most of the time). Gloves to protect your masterpieces, and the Kodak Metallic paper looks like a million dollars.
The only hitch I ever hit was a file-name with a double hyphen in it -- that confused their file servers and crashed my file upload. But that was my fault, sorted out sharpish.
Worth a trip to Hoxton ... and they give you biscuits.
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