I picked up the Hero Bases to have a look at at the weekend. I made three of them up. Generally they come in two or three pieces and there are no instructions, but its pretty easy to assemble them based on the pictures on the back of the box. For my order force I went with the three most generic ones. There is a fairly broad range - some of the bases would definitely look better with chaos models on (luckily I have a few of those knocking around...).
The detail is generally better than the shattered dominion base sets - its more defined and the fact that it is made up of multiple parts seems to give a better finish. As usual they paint up well too. I think if you are after an introduction to scenic bases for characters you could do a lot worse than these. They also make excellent starting points to add extra details too. I added skulls to these, and am also going to add tufts and snow to match my army.