Congradulations Doug and Matt! That was probably the second ascent. Aside form my playing on it,Your trip was one of only a couple forays I have ever heard of that dealt with the I-rock in winter conditions , believe it or not. So , it has interesting rock quality but , I have so much fun climbing on it . The next thing you should look for is Rime Dog .It starts in the left steeper gully and goes straight up from there. It is my favorite and I may repeat it for the 3rd time this weekend.
As far as the East Face is concerned the rock at the very start is bad .the middle is great but the finish is bad too. I have climbed stiff cracks there in the summer, but it is a bit sunny for winter stuff except for March Madness, a pure water ice route. Good job!