After reading Strobist, I almost purchased the recommended cheap old Nikon flash. However, I also wanted a flash to be carried around for impromptu situations that I could have better control over, I felt that the Nikon would be too specific to the Nikon cameras.

My personal preference in natural-looking photography is to search out beautiful lighting instead of trying to create it. It has a habit of surprising you with beautiful colors and glows and shading. Plus, it's cheaper and I'm stingy. So I picked up the Sunpack Digital Flash.

...or how I purchased three optical slaves but only have one functioning optical slave at the moment...