Well just as the Rosh haShanah Machzor changed my perspective on the prayer service, so too the Yom Kippur Machzor has changed the way I daven forever. The Translation is lucid, the layout clear, and logical and a pleasure to use. The extended vidui is at the back, which can be a bit difficult to wield, but is not overly cumbersome that it was detrimental to the prayers. The commmentary there and layout was detailed, but it is more useful to study the whole thing well in advance, and then during the prayer... more info
A help in understanding the meaning of the Prayers:
The Machzor provides an overview of the meaning of the day, and valuable notes on the meaning of the various prayers. I have made use of it for many years and find it highly valuable.