Have just gone through the process with Jaco and this free PCB offer. Sent for some Arduino-compatible PCBs whose design files you can find here:http://github.com/freetronics/KitTen
All the communication was on the 17th, after sending the EAGLE .brd file they replied with the gerbers on the same day. They looked fine so I paid the small fee and went on holiday. On the 23/12 they replied with the parcel tracking details and a photo of the parcel.
The parcel arrived on the 30th with the boards very safely packaged, and a bonus sixth board:
A tiny scratch on the heatsink area on one of the boards, so we'll call it the free one - however it doesn't affect the use. It was good to see their code placed in the ATmega328P footprint, however I can't say if this was intentional or just a fluke.
In the past I've only used two PCB suppliers, however these from Jaco look fine and we look forward to building up the boards in the next week so see how they go. If you want any photos in higher detail, let me know.
Overall a pleasant experience, and thanks to Jaco for their generous offer.