Seems to me like I would use the bike for the same use as my Tarmac SL3, and that my money would be best served to invest elsewhere. I don't think that I can afford to jump on every deal that I find, and that it would be wasteful. Sooner or later I would end up hoarding bicycles and as one of you said, it would end up collecting dust.

I am very happy with my Tarmac SL3, so seems another road bike would not be that advantageous. It is probably better to use the funds for more biking gear and future upgrades on my current bike.