I have an older pair of Shimano S-Phyre shoes with 18,000 plus miles on them. I think they are the first-gen S-Phyre shoes, so my following comparison is with these. They are super comfortable, but my left one is ugly due to serious scuffs from a bike crash I had a couple years ago. I chose the RC703 for a replacement since it adopted much of the design from the S-Phyre model. After 600 miles of use, I can say the 703's foot comfort is almost the same as my old S-Phyre. I personally can't tell any difference in the stiffness between the two models. The 703 toe-box is similar, but the S-Phyre's might be a little better form-fitting on my feet.
Shimano seems to have saved costs on the interior of the shoe and its footbed. The 703 doesn't tout the Silvadure treatment, but I used a nanosilver spray on the inside of the shoes and footbed for an antibacterial and odor guard. So far, the bright white outer surface seems to clean up nicely with a mixture of Simple Green cleaner in a spray bottle. Hopefully, the heel pads will wear longer than those of my S-Phyres. Although they have two BOA closures, they are not the LI2 BOAs that can both tighten and loosen without pulling up on the dial. That's a small sacrifice to put up with in order to save a lot of money. I do recommend these shoes for anyone wanting the feel of an S-Phyre for much less cost, especially when on sale.
In the past I sometimes bought aftermarket cassettes, and when I'd bring the bike in to get help smoothing out some janky shifting, the first thing that I would hear from the mechanic is do you have a Shimano cassette you can install? The advantage of shedding a few grams for a uniblock cassette don't seem so great when you can't get a clean, reliable gear change.
When I was racing, I would spring for the DA cassette for my race wheels, and if money were no object, I'd probably spring for that, but nowadays. Ultegra is the go-to.
The most comfortable SPD cycling shoe for wide feet ever. My feet don't get too hot when riding in 90-degree heat or too cold when the temperature is 40 degrees. The newer version of the shoe fits like a glove. This is my second pair. That's not to say that my first pair is worn out after nearly 20,000 miles of riding tarmac and gravel. I just wanted a backup shoe with the exact fit when the time comes to retire my first pair of RX80. Highly recommend.
Bought on sale for a climbing century. I was concerned I would not be able to use it with my Shimano 9150 DI2 since it was not recommended. I run a sub-compact (50/34). It worked in all gears but didn't want to risk going big-big gear option. So I set my DI2 to full syncro mode and limited gear options to drop down the front to 34 when gearing down (higher up on the cassette) on the rear cassette from 27. This avoided the big-big gear selection that put a lot of stress on my rear derailer. Worked great!
