I've got a Wix site that I'm pretty happy with. There have definitely been some frustrations, and it does seem like I've been missing out on some customization options that would help with SEO, but for certain key words my site is now showing up on Google in the top 3 of local results and page 1 of organic results. I'm admittedly pretty clueless regarding SEO, programming, and most of the stuff talked about on Moz, but I feel like Wix has been an easy and inexpensive way to get a good looking site that gets results.

Had the same question, these answers are helpful, thanks!

Thanks Wyatt, I was curious about author tags as well.