Feel free to purchase whatever chain brand you feel is the best. I like to keep Shimano with Shimano , Campi with Campi and Sram with Sram. Using matched chain & transmission is nice but not necessary. The truth be told even KMC makes good chains that works with all the systems. Proper component alignment/installation , proper cable tension/lube -- shifting will work great. There is alot of sales hype out there and even some harsh criticism for deviating from the sales hype. I love my bikes - been wrenching for 38 years and will not push hype at my store. On 1 of my bikes I am running Sram Force with Shimano DA cassette and a Campagnolo chain -- works great -- no hype just fact.