Check out Brystons' website, they have reviews of the 60 and 120 but I think the 250 is very recent.
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Hi - I own Vandy 3A Sig's, and am using a 4B-ST as the main power amp. As I understand it, the new "250" is simply half of a 4B-ST. I am very pleased with the 4B-ST driving the Vandy's, but I have not heard the "250" yet. Given that the "250" is derived from the 4B-ST, there is no reason to think that the "250" shouldn't work fine with the 3A Sig's. However, an audition -- in your home -- is still advisable.