I use a Westcott 28" Apollo if I'm lighting with a speedlight. It's a bit flimsy (drop it and it WILL break!) but it produces a lovely soft light...if that's what you're after.
Nick I have been thinking about buying one of these Wescott apollo's but suppliers in the Uk are hard to find did you buy yours from a UK supplier ??
I can only find one place and they import it
Chris