I have not had much luck with sedo. But i have had very good results with namedrive. I think your best bet is to try all the major parking services for a few months and see which one works best for what names. I had a name parked on afternic that was doing very well, moved it to namedrive becouse my other names there were doing well but got bad results. I then moved the name to an amazon estore and got great results. So there is some testing and patience that is neccesary to get the best results.