Another point regarding how long it takes to acclimate to a bent. The more serious you were on the upright, the longer it takes, because the farther you have to go. Spencejim is starting as more or less a beginner, so it won't take long at all. I don't know about Katy Trail specifically, but most trails are pretty flat so hill climbing isn't an issue except for future planning. Most 2-wheeled, low-end bents will be the equivalent of an upright hybrid. To go a little faster, look for skinnier tires and lighter weight (the two traits tend to go hand-in-hand.)