We use the RMS system here (and have used it previously) and have found it very good (although can be slowed at times). It's very flexible and easy to use in our opinion. You can 'drag' guests around (haven't we all wanted to do that at times!) on screen and the system is set up so that mistakes are minimised (i.e. you cannot get out of a screen without inputting the information the system needs). We would certainly recommend it.