I had a Speedmax and thought it was quite comfortable for a TT bike. I liked it better than the Cervelo I had before it. New 105 components are great - much stronger than previous generations.

I would say don't get too hung up on weight. Position is exponentially more important. If you're not going to put tons of work in riding aero, then there's no point anyway. You should just get a road bike that will handle better and will get you the weight savings you are worried about. If sounds like you may not have experience riding a TT frame - I'm not trying to sound condescending or dismissive, just don't underestimate how generally uncomfortable/unstable a TT bike is vs a road bike. I've raced on both.