I'm replacing our 11-32 Shimano cassette with a 12-28 SRAM for all but the less than 10% or our rides that have sustained climbs at or above 9 or 10%. The spacing on this cassette (12-13-14-15-16-17-19-21-24-28) will really help our cadence mismatch and make the majority of our riding more enjoyable. I also have one of the Harris 13-30 cassettes, but I had some difficulty getting it to shift well.
This will take a bit of getting used to since I'll be shifting more cogs in the back as I change chain rings, but I don't see that as much of an issue.
Anyone else running this cassette on their tandem? It does look like it will work well on our unusual quad chainring setup, but I don't know about a normal road triple.