Linda -
On your Shimano set you have 2 levers to shift. The brake lever (further from your body) and the smaller lever (closer to your body).
The same is there on SRAM. However, you do not use the brake lever to shift at all.
I have Shimano on my road bike and SRAM on my Bike Friday. Hands down, 100% X 1000000 it's harder to shift my SRAM. I feel I need to HEAVE the chain around manually, instead of the bike doing the work.
Basically, instead of using one lever to go up and another to go down, SRAM has you push the 1 lever to shift one way and the same lever pushed much further to shift the other way. Having spoken to a friend that works at the LBS, she tells me that men generally don't mind SRAM as they have larger hands. But women tend to feel that they have to really shove the levers because of the distance it must travel.
This is compared to Shimano of course.
I'll take some pictures for you of the differences. I won't say I hate SRAM, but I sure won't get them again.
Denise



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It's the whole "shoving the lever" thing that is my specific problem. The throw on my Ultegra shifters is just way too damn long, and my weak (and usually painful) hands simply can't tolerate it for very long. I have had this bike back at my LBS more times than I care to count for this very issue. Eventually, I ended up taking it to another bike mechanic and he found that the shift cable for my RD was too short, so he lengthened it and that did help somewhat for awhile. But now it's starting to feel hard and stiff again. And my front ring is an entirely different story...it's been hard to shift from day 1 and even with a brand new replacement shifter, there is zero improvement. It is SO difficult to shift my chain from the small ring to the big one, that I often debate on whether to go down into my small ring on hills because I know it'll be a b!tch moving it back to the big ring. It has never shifted on just one sweep of the lever...it takes me in the ballpark of 3-4 sweeps of the lever before the chain will jump into the big ring. It's extremely frustrating because I always have to take my eyes off the road and LOOK DOWN to confirm if the chain has moved onto the big ring! 
