Very basic. I uploaded a CSV data set (not large, approximately 200 rows), and for more than 30 minutes the site just kept "indexing" it. Nothing else happened, I couldn't stop and restart, or upload a different set. Logged out and logged back in, and the data set was there. Charts take too long to generate. The user interface is extremely poor. As it stands, there is no reason why someone would use this over Excel. Sent a support email and after 4 days still haven't received a response.
