I am planing to buy two flashes . I want to use them both on stands with umbrelas ( small studio set up ). I went to the store and I've been told that Promaster will do a job as good as a Nikon one will for my F100. I was also told that Promaster 5700 will work with a digital Nikon if I ever get one , except that I'm going to have to change the module, which is fine with me. Promaster flashes are not very expensive , I just don't want to invest some money in something that is actually going to do maybe just half of the job right , or even less. I guess my question would be , if Promaster is not good , than what do I get instead from Nikon ? Does anybody know a link where you can see both brands listed with pros and cons?