I have tested both Aeroscout & Ekahau systems & we are in a process of implementing RFID system Trust Wide. The reliability of RFID system is depended on various factors but some of the core factors are as follows:
.If Trust has got wireless infrastructure in place, how good the wireless coverage is? I have seen RFID system failed due to bad wireless infrastructure. The other solution to this is to have a readers but this is quite an expensive option.
.Secondly, for active RFID tags, tags configuration is most important because battery get depleted very rapidly on certain settings which will increase your on going maintenance cost of the tags..
.Aeroscout & Ekahau system can integarate into our database systems.
if you need any more info please do not hesitate to contact me.