Have just come inside from watching the ISS/STS-115 flyover - awesome, heavens above under-estimated its brightness....
a predicted magnitude of 0.8 was an observed magnitude of at least -2 - and it flared, for about 10-15 seconds (at approx 20 deg alt in the WSW) it did an iridium like flare to I think -10 or so - REALLY bright
I've seen -8 Iridiums - and this left them for dead by a large margin.... maybe the new solar panels are at the right angle - I wish the camera was trained to the flare area!!! I had it trained to catch them passing between the pointers and crux.....
(This was all from Newcastle)