I bought a new 2014 5075e (Tier 2) in November. After shopping for awhile I got wind of what was coming in 2015 and pulled the trigger quickly. Luckily I ended-up with a great dealer because the tractor has needed some attention (under warranty). I think I bought the right machine. Last summer I sat on a 4066R (Tier 4) and noticed that the hood was about 12" taller than the 4720 which it replaced. Under the hood, I couldn't even see a motor, just a lot of stainless steel smog gear, or at least that was my impression. Besides that, because of the cab design I couldn't even see the loader bucket when it was raised. After that I started looking at the 5E series. Visibility on the 5075E is great. The hood sits low and flat. I don't like the idea of a high temp, burn-off and don't pretend to know how that system works but what I do know is that heat dries things out prematurely. It can't be good for wiring and all the other plastic parts in its vicinity. I think the 5Es already experienced an unrelated heat problem with hydraulics that caused fuel tanks to melt, a problem that has since been solved. Nobody has mentioned it here so far but I think the price of the 2015 5Es went up by $3000-3500 and the cost to maintain the Tier 4 system will come into play at some point. For those reasons, I'd bet I could sell my 5E for at least what I paid and that it will hold its value better than a Tier 4, just speculating... I would recommend searching for a Tier 2 machine. I've always preferred to buy my vehicles at the end of production, or last year for the model. It seems to me they've had some time to redesign imperfections. I think they hold their value better as well. I would avoid buying a reworked version in its first model year. I realize there are other points of view. This is just mine...