I'm looking at options for my next bike and contemplating whether there's a good enough reason to go for Di2 (if it can be done within a reasonable budget). The Merlin Cordite is currently £1500 with Di2 so the direction of travel price wise, certainly on that older 6800 groupset, looks promising. My dilemma is based mainly around how easy / difficult it is to tinker with the indexing if I need to swap wheels or cassettes. I'm assuming it MUST be simpler to index given that you take the cable tension out of the equation right from the off, but I really have no idea. Any opinions on the pros & cons appreciated; option one is just to go Ultegra as an obvious upgrade on my current groupset but as I intend the next purchase to be a long-term mile muncher it'd be nice to have something a bit more future-proof and reduce the risk of wanting to upgrade again in a couple of years!