As long as REI has a certified fitter, I think that it is fine to get a bike from there. However, as far as I know, REI does not seem to have as knowledgeable of bike salesman as the local bike shop. Feel free to have the TE forum disagree with me.
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2012 Specialized Amira Elite, upgraded carbon handle bars, Jett saddle 143mm switched to 145mm 2012 Selle Italia Max SLR Gel Flow saddle

2011 Specialized Ariel Sport,suspension post,Serfas Rx Women's Microfiber saddle