Besides Lagostina, I also bought an electrical 高速煲 called PRIMADA. It costs me $1188. It can be bought in Sogo too.
I also use it to cook congee. Same as Lagostina, you can have very 綿 congee in less than 45 mins.
The best thing of this is you dont need to watch fire. And you can set the time when you want to start the cooking.
For different 高速煲 comparison, please visit here:
http://www.baby-kingdom.com/modules/newbb/viewtopic.php?mode=viewtopic&topic_id=559619&forum=46&start=0&viewmode=flat&order=0