If you just like doing your share of the work then this system doesn't work ! Why, because the few who continually bid for their favourite destinations or overnights only leave the less popular flights or destinations that the system automaticaly distribute amongst the rest. After a while you realise that you simply are not getting a far share of whats on offer. So just to get that fair share, youv'e got to go and bid for it which is a pain in the butt !
My philosophy is that we all should share the flights around so that we all get our share of the good and the not so good. If someones 'like' is your 'dislike' then fine the balance is maintained and everyone is happy, but it seems that doesn't happen very often.
To get a specific day off, providing you plan well ahead, it seems to work OK.