Get one! So easy to work with a small studio setting. I have 3 speedlights, an SB600, 700, and a 900. I am able to adjust the output of each flash to get the effects I want. You can shut off a flash or its group to see how it affects your overall lighting. You can adjust EV levels with ease. I love mine and I plan to keep it a long time.
I think having a small speedlight studio with softboxes, and umbrellas with associated light stands is really a great idea, even if you have studio strobes. You can't beat the portability and ease of use.