follow the link to my review of the reapers. You may have to read through the rating page to understand the tests, but it will give you an idea of how they stack up with other heads.
http://www.broadheadtests.com/NEWHEADS.html
As far as quartering shots, for the most part they are not a problem with most mechanicals as long as you don't get really steep and have the bow tuned properly.