Getting a new home cinema room/music studio installed (loft conversion which will occasionally be used as a guest room) and as I'm on a spending spree (single handledly doing my bit to prop up the economy!)

I thought about getting a fingerprint lock installed at the same time as the firedoors have to go in...
Don't want to blow a massive amount, but this looked good (and has that "gadget factor" even though there are probably much fancier and more expensive units out there)
Q-See QSB180 Fingerprint door Lock with Keypad: Amazon.co.uk: DIY & Tools
Any thoughts? Pros? Cons?