After hearing Michelle, Morgy and Luke going on about coming in with trims full open. I reluctantly tried it (1/2 open)
To be honest I gave myself a fright it was so fast comapared to what I was used to. The ground rush was scarry in my opinion, but I did have a really nice landing in nill wind, much to my surprise.
I now routenly land with trims open to just over half ( I have not tried it fully open yet, for two reasons, 1. I am a big girls blouse and I am scared, 2. Since going to half I have not needed to)
I have to agree with Mark once you have tried it and got over the initial ground rush, the extra flare control does make landing much easier.
If I were going to try it again for the first time I think I would only let the trims out about an inch and get used to it there and then slowly increase until you get to a level that works for you.