My wife doesn't care for direct contact, unless it's
very gentle and her clit is wet/lubed. She likes direct contact during oral when I use the flat of my tongue, but rapid flicking (another bad technique perpetrated by porn?) is a no-no.
To stay on topic, the easy access of a large clit would be fun, at least from a guys POV.
For those who don't venture into the Off The Wayside forum, NSFW!
http://www.tfproject.org/tfp/off-way...it-vaccum.html