I am planning to use them for my spectrum analyzer RF board since they have a defined layer stackup. I had a hard time finding a boardhouse that could tell me what the dielectric thicknesses in a 4 layer would be. One even said that it depends on what materials are cheapest at the time. I also like their barebonespcb.com service for 2 layer boards.Advanced Circuits has a new special - three 4-layer boards for $66 each. 6/6, 15mil holes, up to 30 sq in, full mask/silk, 5 day lead. No panels, though.
FYI this is the company whose tech guys helped us get PCB's gerber output correct. They're good folks.
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Darrell Harmon
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