As shown it's close in MSRP, but I should mention the wheels aren't mine and that the price out the door wasn't much more than other Ui2 equipped bikes. Considering that DA Di2 still has a street price of more than $3K here, and might be obsolete soon (different wiring, etc.) it made more sense to take the weight penalty and put it towards the frame. I was going to just go with mechanical Ultegra, but decided it was wiser fronting up the $1,000 now than inevitably upgrading in a few months.

I think if one rides DA Di2 and Ui2 back to back, then yes, you might notice a difference in how fast the RD shifts. So maybe it's not 99% in that respect. But for all intents and purposes, the shift is still fast enough that it's barely noticeable by itself, and definitely not going to cause one to lose a race. Weight wise, yes there's a penalty, but I live on pancake flat terrain, so weight is not a huge concern for me. If anything, the price difference between the DA Di2 and Ui2 could go towards upgrading other stuff.