You could always ask Grant at Rivendell about the bike and whether this particular one might be the right size for you.
grant@rivbike.com
As far as I know, Grant designed the Redwood. He'll ask you what your pubic bone height is and then the size of the frame you're looking at to see whether it should fit or not. He will also tell you that unless you plan on racing, this bike will be fine. Choose skinnier tires if you want to, but like Sch says, its the motor that makes the biggest difference.
If you're a tall, heavy rider, you may want to look into Rivendell's A. Homer Hilsen with double top tube for long distance cycling. That's a really stiff frame for clydesdales, if you fall into that category.
Oh, and naturally you should keep your Trek. More bikes in the stable is always better
