Yes, you can use the Red cassette with your Force group.
As for SRAM...I had Rival on one bike...and now I have Red on one of my bikes. I also have Dura-Ace 7800 on a bike...and another bike with a mix of Dura-Ace, Ultegra, Ultegra SL, and 105 (frankenbike).
Functionally, the only difference is the SRAM Doubletap system. It's super easy to get used to. And personally, I think I prefer it over Shimano. But overall, it's just not that big a deal. You'll notice SRAM shifts a little rougher...you hear and feel the shift more than with Dura-Ace...in that way, SRAM is more similar to Campy, neither have that silkly smoothness of Dura-Ace. And even that is personal preference...some people prefer the more 'organic' feel of SRAM/Campy...others prefer the ninja like performance of Shimano.
I prefer SRAM over everything. They're affordable...light...and reliable. What more can you ask for? And their Doubletap system is actually a minor improvement, in my humble opinion.




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