Good morning,
I have 10 speed Di2 and I think that it is wonderful, but on the idea of future proofing;
- When Shimano went from the original Dura-Ace Di2 to the 2nd generation Di2 they changed the system entirely, parts weren't interchangeable.
- !0 Speed Di2 Ultegra had a relatively short production life, so new spare parts were/are hard to get.
- 11 Speed Di2 Ultegra was quickly updated so that front and rear mechs could provide device IDs to the firmware leading to the gears refusing to operate if Shimano didn't like the combination, for example you can't use a 10 Speed front mech with most 11 Speed rear mechs.
- This ability could see 12 Speed Ultegra Version 1 being incompatible with Version 2 if they come up with some wonderful idea.
- The impression I got was that this was done to ensure that everything works perfectly and anyone who can afford Di2 won't mind too much.
- With Shimano apparently using Di2 as the differentiator between Ultegra and 105 I would be cautious about the price of consumables, chains and cassettes, if this matters to you as there is less need to discount Ultegra as it is pretty much the same as 105.
The thing about the tax man not caring is that it is always a risky thing as Salary Sacrifice Schemes have to be declared, so it is easy for HMRC to query the relevant databases and look for large sacrifices which probably meaning expensive bikes not being used for commuting.
Along with the fact that blatant tax fraud is not something to be proud of, and there is the risk of change in accountant meaning a change in policy, we no longer turn a blind eye to any misuse of the scheme.
Bye
Ian