Since there wasn't a demo version, but the reviews were good and I liked what I saw in the downloadable manual that's on the website, I decided to bite the bullet and buy iDraw 2.2.
So far, it's been really very good for basic vector drawing needs and has opened all my simpler EPS and AI files with ease. Exported files seem good to when I pull them back into Illustrator or other apps. The UI works well (and is intuitive) and given the tiny price, it's really excellent for working on simpler projects -- especially if you use it in conjunction with the iPad version of the app (with fonts being the biggest limitation unless converted to outline when switching between the two versions).
Advanced color, typeface and stroke controls are lacking, but iDraw works fine if you don't expect it to be Illustrator or CorelDraw.
I probably won't use it to lay out complex illustrations, maps or diagrams, but for individual illustrations (characters, objects, logos, etc.) it's great and the import/export is reliable. I do wish it supported dropbox syncing instead of icloud, but that's quibble. Great app FOR THE PRICE.