I liked Zoho products, but their wiki is a real nightmare. I’m using it with a group of students because their university decided to use Zoho online office suite, and it is totally unusable. Zoho doesn’t have understood the wiki philisophy. And there is a lot of bugs! So, don’t use it.
(disclosure: I’m cofounder of netcipia. This is also why I know what a wiki must be…)