There is no doubt that IWB technology has a "wow" factor that is a marvelous thing when you first use it. But will the installation of one of these devices in your classroom have any real impact on long-term student engagement and learning outcomes?
And will any improvement in these areas be commensurate with the tens of thousands of dollars that it will cost to equip multiple classrooms with this technology?
If you are interested in investigating the impact of large-screen "touch" technology in your learning environment, there are some alternative options which will provide a similar service, without blowing the budget.
Some of these options are listed below.
Interactive WhiteBoards (IWBs) are very much the flavour of the month for many school systems at the moment. 
