I have had the etap system for over a year now and have always wanted to be able to shift while seated climbing on the top of the handlebars and these work great.
I run these blips on two of my bikes. I mount them close to drops so when sprinting I don't have to move my hands at all.
Find these very helpful especially on those long climbs when I dont have to reach for the hoods to change gearsi have them mounted facing rear wards on the handlebars ,so my thumbs fall naturally on the buttons.Would suggest you experiment with what is the most comfortable and ergonomic position based on how u ride ,System itself works well
Being able to put the shifter where I wanted it was a major selling point for eTap to me. I've wanted to shift with one hand for years, and at last I can. These blips let me add a left shifter on my right brake hood. I just love it! I do with the buttons clicked or snapped a little so the had some tactile feedback. But still, they are well worth the price.
You are only paying for the licencing of proprietory telemetry.At close quarters you would be vulnerable to riders overriding if your drive train has 2-way FM band.A 10$blue tooth would suffice for the coach monitoring the cyclists' vital the bike's mechanical perameters