I’ve been lucky enough to get hold of some Vivitar flashes.  Two 285s and one 283.  I bought them off a guy from work.  They also come with a couple of optical sensors, which means I can now trigger four flashes using my two Phottix Strato II triggers.  The other flash is my Nikon SB-900.

The Vivitar flashes are pretty basic, with 4 stop difference in flash power.  However they are supposedly robust, so I will use them for outdoor shoots and see how they get on. Here’s a picture of them with one of the optical triggers.