I've been using CE only a few days, but overall find it very intuitive and am most impressed with the super fast and accurate support. In fact, I'd say this is just about the fastest and most robust support I've personally seen in the Joomla! ecosystem.
There is an additional Google map feature that I had not even noticed when signing up. It works well, and eliminates the need for a separate map tool, although I'm still having some challenges with formatting the two together. This may be due to J! 3 issues and CSS conflicts, but support is helping me out with this as well.
I've used a few J! contact form tools over the years, and although this might not necessarily be the simplest to use, it offers a great degree of customization and features.
After trying a couple of other extensions without much luck, I decided to give IT Import for K2 a try. It worked amazing well!
From reading the documentation on the website, I thought it was going to be a challenge to map the various fields, but that was not the case. It was very intuitive and extremely easy.
Great extension! Thanks!