46-11 is a really big gear. When the 11 tooth cog was first introduced, it was intended to be used with much smaller front chain rings. For example, many classic bikes came with a 52-14 top gear. 42-11 is a higher gear than that. I'm not sure I'm going to end up using it, but I have a spider that fits mountain chain rings to SRAM road crank arms. The thing I like about a 42/28 crank is that I can use an 11-32 cassette, and I almost never have to stand on steep hills.