I started using my new Fondriest TF2 1.0 that I built up with DA 9000 (yes, mechanical) and it's awesome! By far the best I've ever used and the groupset operates so effortlessly and smoothly it's amazing. Admittedly I've never tried but I can't see why I would pay an extra grand to have motors take that 'effort' away.
I believe people who say how you would never go back but it's not worth the extra cash to me. Plus I'm old school (Old's Cool) in that I like the romantic notion of having one thing still working without electricity, chargers and batteries.
Just my $0.02, other opinions respected!
Actually, I feel the same way as you. My original preference was to stick with the mechanical system. I didn't like the battery sticking out of the down tube and the whole idea of it just seemed like adding unnecessary complexity. However, a guy I ride with had the DA di2 7000 series and said he just loved it. Of course, he would probably feel the same way about the new DA 9000 mechanical gruppo. Anyway, I really wanted the Evo, but I just couldn't warm up to the white, black, & gold paint on the mechanical DA equipped bike. I LOVED the black/red paint on the di2 bike AND it had a battery hidden in the seat post. Ugh. About $3,000 more! Finally, the LBS owner is a friend and he and I talked about it. He said he would 'make me a deal' because he really wanted to get one or two out on the road in our area. We came together on an acceptable price and I decided to go ahead with it. It has been a long wait, but I was unable to ride for about 12 weeks due to a fractured ankle suffered on what was supposed to be an easy Sunday morning recovery ride and that significantly diminished any impatience I might have had.
Now, with my fitness at a multi year low as a result of three months without riding, I don't want to be 'that guy' that shows up for the group rides with the $11,000+ super bike that keeps falling off of the back. Looks like I will be doing a lot of solo rides for the next couple of months!