Hey man,
I've got the Einstein and I've played the OD100, well a variation of it - seems like there's so many options on those with the transformers etc.
Anyway, the Einstein has a great clean channel, the entire amp is kick ass, however; I don't know that I would really call it like a hot rodded marshall tone it's totally it's own thing in my opinion. The best way I can explain it is kind of like a super harmonically rich distortion of a Soldano crossed with a Mark IV, some people will probably argue with me... but that's what my ears take from it.
I love it and would recommend it if your looking for something different.
The OD100 - I was not a big fan of it, but I only demoed it, it wasn't a bad amp, it just sounded... I don't know it kind of had this deep resonance and felt kind of empty and void of magic. It was very tight and articulate, I don't know I just wasn't feeling the soul in it.
I have heard the Bogner Shiva is a fantastic amp and is more the flavor you might be looking for, but I would recommend playing it, bogners again have a flavor all their own!
Dallas