I purchased these as an upgrade to my 105's and I won't be going back to Shimano!
Super smooth shifting, no wobbly brake levers and 100gms lighter to boot.
SRAM's double click seems more intuitive than Shimano's gearing.
Merlin's service was as usual impeccable and I thank them!
These Sram Rival shifters are great value for money and do a great smooth change every time, I also run the next grade up from the Rival that being the force shifters, and IMO there is little if no difference at all except of course price...