My bike came with 28mm version fitted in, I wanted to replace it with the same model and 25mm, maybe in future will mix 25F 28R. 28mm on my rim measures 27,4mm, so the difference between them is small. The biggest issue in my case was to mount them. I tried fitting them numerous times, on both rims it always were ending with uneven fit. Nothing helped, squeezing, pumping more or even making a short ride. I ended up with adding some soap on the bead... Then they finally popped in properly. Next issue is with taking them off, it is almost impossible to do it with bare hands, I'm typing this review with burning fingers and scratches. I was putting so much force while disassembling that some rubber went off from the side. I went to the local bike service, they wasn't able to put it off too xD. Not sure if this is specific to my rim (TR, 18c), but it is pointless to use them with tubes in this case, ordered tubeless kit.. Hope they will seal easily. Ride quality is good, done just short ride so far, no experience on wet surface yet.
Have now ridden 2000km on these 25mm tires. Ride wonderfully smooth, Mounting was fine (Zipp 404) myself I use schwalbe easy fit and Schwalbe expansion barrel The tires look nice, and do not pick up small stones from the golf terrain where I often ride for a long time. The rear tire can last another 2000km if I compare the wear markings, the front tire is still like new. First experience with Tubeless and I like it, Very nice tires. Next time I will order a 28mm tire for the rear.