Hoodia gordonii recommendations...?

Has anyone tried hoodia and if so, what did you like/dislike about it? I'm currently taking DEX L-10, but it doesn't suppress my appetite the way I need it to. I'm thinking of switching to Hoodia XR or Optimum Hoodia which are higher-dosed, extended released pills that I've read some good reviews on. Anyone out there familiar with any of these diet pills?