Anyone know of Cactus flashguns?

[norrisphysio]

I shoot on M43 (Panasonic G6) and currently use a Metz 44 AF1 which is good, but have come across these Cactus guns which look interesting. Not sure of the quality, but they have built in wireless control for any camera so should work with M43 and have an on camera unit to control several guns wirelessly outside line of sight http://www.parkcameras.com/Search/cactus%20flash/ Anyone used these guns or this make and can comment on build quality and ergonomics?