Athena Dome F100 for OMD

Has anyone used this dome on the olympus OMD housings for the em5 or em1?

http://www.divervision.com/ports-gears/olympus-om-d-mount/athena-optical-dome-port-f100-om-d-mount-for-pnansonic-lumix-g-fisheye-8mm-f3.5-lens-OPD-F100-EP08.html

If so, what's the verdict and also how does it compare to the Zen dome?

Has anyone tried the samyang 7.5mm FE behind this dome?

Thanks,

Chris

There was a positive review on scubaboard for it.