For about a year I was the biggest proponent of digital wireless around. Then I started having issues during ceremonies with my lavalier mic setup. I don't have any experience with the Shure system, but it does run on the same frequencies as my Line 6 stuff. Any wi-fi or other (read Cellular) activity in the area will greatly decrease its reliability. I will tell you that I have changed to Sennheiser UHF for any critical situations.
Having dropouts during a ceremony was just not acceptable for me, so I bit the bullet and made the change. I still use the digital for really close applications, but not the important stuff.
Sennheisser ew's for me . Not digital, but extremely reliable.
Sorry Brian, no experience with that Shure. I also can't say that I've tried a lot of other recent brands/models. Once I find something that works well, I stick with it until it doesn't. It's been about 8-9 years for me.