I've used the omni for Negative Eyepiece projections of the moon both in conjunction with an eyepiece (10 mm) and with an adapter to fit the camera straight into the Barlow (sorta like prime focus, but still negative projection) and found that with the eyepiece or the Barlow on their own the images were ok but in conjunction there was an awful lot of flaring.
Celestron HD102-EQ refractor
Canon EOS 500
Celestron Omni Barlow
Celestron E-lux 10 mm EP
First image just the barlow (excuse the lack of sharpness in the closeup, either poor focus but more likely from mirror flip)
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