I would hazard a guess that you get the charts out in an unfamiliar airport but lets face it, run of the mill ports you can state the FAF height check and missed approach verbatim. Yes there will be secure locks and attachments for the Ipads, the only thing I am thinking is if you get into Unusual Attitudes the Ipad is going to orientate the charts upwards and it will really confuse you, how can you check the GP check height when the chart is inverted? Which means the aircraft is too I guess! lol.