
First and foremost: the "all inclusive" deal. No space limitations, no bandwidth limitations, no limitations on number of websites handled (as far as I know for the latter).
Framework is awesome and almost all types of small web apps can be hosted there.
Everything is managed with a super simple control panel.
Support is excellent.
I moved around quite a bit from hosting provider to hosting provider before landing on IX. Review collected by and hosted on G2.com.
I guess the strongest issue I encountered are prolonged down times, which are (a) rare and (b) not unique to IX as unfortunately all hosters are having those once in a while. Even the mighty Amazon.
Still - my advice is to not host anything mission critical with IX (or any other hoster for that matter), and if you do - do take care for some CDNs/backups. Review collected by and hosted on G2.com.