I had DI2 on my Orbea Opal. Liked it alot but talk about NO feeling when you shift.
I now have SRAM Red on my SL2 and enjoy riding it more than the DI2.
The DI2 is effortless and has the WOW factor but I don't feel it is worth what they want right now.
The SRAM is quick shifting and I love mine so far.