Wish I had a spare box to give Caldera a try on. Been using Onyx 10 for about a year now and while it's not bad, it's not really good, either.
I think obtuse is a good way to put it. Vital options buried in menus and a queue system as flexible as an I-beam are the biggest detractors for me. The Job Editor is a breeze to use, though, and once all the fiddly settings are figured out quicksets keep me out of the maddening menus.