2826 Wave Robotics used Wix for a while and for all the aforementioned reasons of slowness and incompatibility, we had a lot of heartburn with using this tool.
In the end, the 2 nails in the coffin for wix were:
1. Little to no team member support. Basically we couldn't do anything with individual permissions, uploads and downloads or anything that made this a tool that the team could use to help manage projects or products.
2. We cannot use wix and submit for any website awards. Even though wix can be student created and maintained, we were told by FIRST that we could not qualify.
That being said, we ended up coding our own site in Dreamweaver (
www.waverobotics.com), but we still struggle with maintainability and functions to make it exactly what we want.
We have just recently been training on Joomla as our main CMS and overall, it is fantastic, though a bit hard to learn if you are used to thinking in HTML terms. One word of caution on Joomla hosting: Heed all the warnings on GoDaddy being extremely slow. On average, we are getting 5-7 seconds of load time per page.
Overall, Wix is very cool looking, but make sure the sparkle doesn't outdo the substance