Hmmm...the Houston Transtar site confirms this.
Looks like US-59 in from Richmond is a far smoother commute than I-10 east from Katy.
59 has the absolute worst and craziest freeway drivers in the city, at least on the downtown to Sugarland route.
There are alternatives, tho; you'd be surprised how quicklyl Westheimer moves, for example.
The worst part of I-10 is the Highway 6 area. Although it all depends on the time of day--if you start work early (like 7 or 7:30) you'd be fine.
And not to be a chamber of commerce for Katy but there are alternatives around that don't involve chains/malls; even the Cinco Ranch area has a nice little grouping of shops and restaurants on 99, many of which are local. I don't get the impression that Richmond is quite the same, but I don't spend a whole lot of time there.