I will 2nd this one.
The problem with umbrellas is that if they're shoot through, a speedlite cannot fill a large umbrella, so reflective surface umbrellas can give you more bang for your light when limited to a speedlite. Having a reflective umbrella with silver just makes it even more efficient to make the most from the low power speedlite and spread it more evenly on a larger modifier where speedlites have trouble spreading out. Adding the diffuser panel makes it a softbox but it's still a fairly efficient softbox for its size relative to a speedlite's output. And taking the diffuser off, one can get different output too. Very versatile and it controls spill. For a one-modifier-approach, the brolly box for a speedlite is easily one of the better tools for a general approach,and at $30, it's crazy good for the money.
I have these in several sizes. They're great.
And varying the distance between umbrella and speedlight makes it a lot of different sizes modifiers in one