Shimano ~15-20 quid depending where you get it
Wi ~80 quid
so, would have to to either be 4x better, or last 4x longer to be worth it…
Reality is they are a lot better pickup wise than Shimano/other cheap options and seem less prone to spontaneous failure, but I’d be hard pushed to say 4x better.
Longevity wise, you have to factor many things here, where and how you ride etc, but they *do* last longer, and they’re re-buildable which counts for a lot, bearings are cheap even if drive rings aren’t. I’ve only knackered one drive ring in about 5 years, bearing seems to need doing once a a year on 16t, less frequent on my 17t one.
Personally I would say yes they are worth it on longevity and re-buildability grounds, but then I’m also getting good results from a Halo Clickster at the moment which is half the price of the WI and actually has even better pickup, don’t think spares are available for rebuilding it but then I’ve not had to open it to do anything yet….could be worth a look.