I run a couple of bikes with seven speed megarange cassettes. The smaller 6 cogs provide some reasonably tight ratios and the big 34t cog gives you a bailout gear without having to run a triple. I like the big jump to the 34t cog much better than a cassette with more even spacing between the cogs. I find shifting from 24t or 26t up to 34t much more useful than getting there from 28 or 30t. Where I ride I need big jumps in a hurry on the bottom end and skipped cogs are wasted cogs.