For some reason I like em. Is it because they are rare and expensive? Perhaps.
They're very weird looking, but do have kinda slinky 'lines'.
The whole 'traditional' pink/purple thing I could take or leave. I'd paint em black and gloss coat, so it look like latex.
I think GW always feel they have (had) to walk a fine line with Slaaneshi stuff, it's supposed to be seductive, but androgynous.
Kinda a tough concept to sell in a game 'universe' marketed to 13 year old boys (or even men in general).
I'm very uncreative and can't really imagine any other kind of war engine that would fit in with Slaneesh.
Actually, I think GW hit the nail on the head with these, it's just too bad they are cast in unobtainium.