Looks great but doesn't actually compact for us at all! 
We do everything as instructed, but it doesn't reduce the load, and all litter just springs back up/re-expands. Bags dont hold on the lip as the bin becomes more full, so constantly having to pull sides back up and reattach. Perhaps we've just not got the nack? Wouldn't recommend at all, just go for the cheaper, standard bin as this is all this has amounted to being.