I have been putting together a complete mobile portrait studio that fits in a single large rolling suitcase. I use Vivitar 2800s for my Key and Background/Hair lights. I use a Vivitar 285 (variable) for my Fill because I can change the power in 1/4 increments, down to 1/16. I have two 33 inch shoot-thrus, and a combo 43 inch umbrella. For "On the go" shooting at a party or event I have an L bracket and an Octo softbox 8 inch and a rectangle soft box 8 inch. I fire my flashes with a cheap Neewer remote trigger set with three receivers. I have a PVC background stand. I use heavy black felt for my low key background. I have a white muslin for my High key background and I am thinking of adding either Cerulean Blue or Sky Blue backgrounds. I also have continuous lights, QTY 2. I use these on the same stand as my Key and Fill with LED Warm White bulbs. If I am in a place with power, I use them as modeling lights, if not, I just snap a few test pics and make adjustments to my exposure using only the speedlights.
I have been messing with them and I really like some of the results. Some. I find I get the best images using the 43" Combo in shoot-thru mode and a large white foam board to bounce for the fill. I clip it to a music stand. Using the bounce card I can free up a light to use for hair while using a strobe to light the background, so in a sense I have four lights.
The only issue I have is lack of models. My wife and kid are sick to death of having their pictures taken.