I disagree...I love my wireless computers and power meters, but there are still issues with signal transmission. Sensors (power meters included) temporarily drop not infrequently. There's also a road near my house where my HRM always reads in the 180s for a half block stretch because of some sort of weird interference. I can deal with brief erratic heart rate readings or stretches of zero cadence or power...gaps in information won't hurt me as long as they are brief. However, if I'm going uphill and needing to downshift it's gotta happen with 100% reliability. Wires are really good at that, wireless is still a work in progress.

I have SRAM etap and have never experienced any interference. However, I have had the HRM issue. Dollars to doughnuts its a underground dog fence causing your HRM to spike. That's what mine was.

... I ran di2 on my previous set up and have NEVER had a failure. Also, Di2 def shifts a tad faster...internal battery keeps a charge WAY longer...just feel as though Shimano is a bit more bullet proof. The blip box on Etap is also more cumbersome and the system is harder to tune. Shimano you can literally fine tune even during mid ride.

For a company that has invented almost all of the innovations currently in use in bike components, Shimano is conservative, iterates slowly and only releases product after they're certain of their engineering. There are numerous examples of Shimano refusing to move off of "aged" designs that still work well:
- alloy cranks
- cup and cone hubs
- their long refusal to support press fit BBs (which they only very grudgingly started to support years after they became dominant)
- cup and cone pedal spindles
- wired Di2
...etc.

All of these designs have something in common: they've not been improved upon by more "modern" designs.

I've personally never had any malfunction with Shimano stuff in ~30 years of using it (since Ultegra was called 600). Meanwhile, I've had Sram master cylinders fail, Sram shifters break, a Rockshox fork seals fail, a Zipp stem fail etc. I only buy Shimano / Pro stuff now.

I just had my blip box fail on me today for no reason in the middle of a ride and the entire system is dead. I ran di2 on my previous set up and have NEVER had a failure. Also, Di2 def shifts a tad faster...internal battery keeps a charge WAY longer...just feel as though Shimano is a bit more bullet proof. The blip box on Etap is also more cumbersome and the system is harder to tune. Shimano you can literally fine tune even during mid ride.

You can fine tune eTap mid ride as well and I think it’s easier to do than Di2.