With its light weight aluminum carrier and the smooth shifting of its Hyperglide ramps, the 105 cassette changes gears with a confidence and crispness that only Shimano components can produce.
I wanted to use a spare wheel for my indoor training but didn't have a cassette. Bought this cassette and swapped from 12-30T to 11-28T, so this is my primary outdoor cassette. I have a Felt AR3 and a Felt Z-85 (which is my primary trainer). I actually find the Shimano 105 to be a smother shifting and quieter groupset than the Ultegra on my AR3. Lots cheaper than buying at the LBS, too. Oh, and going from my 12-30T to the 11-28T improved the top speed on my Z-85 by 10 mph. Of course, without any kind of speedometer or bike computer, that's a rough estimate. I know it FEELS like at least 10 mph. Maybe it's more? 15, maybe? Yeah, probably 15.
I just replaced my original 12-25 CS-5700 cassette after 10,000 miles of use. It has served me well, and at the price I don't feel compelled to change a thing. I have replaced my old cassette with the CS-5700 11-28. So far so good!
Ok I know why you would pay more, but if you are watching your pennies instead of your grams, then 105 is the way to go. This cassette is pretty lite, and shifts very well. 11-25 is a great overall spread with a compact.