Bought this for my lad, who's at Uni - renting the top flat of a local private 3-storey block of flats.
There are, of course, smoke alarms fitted throughout but I didn't like the thought of him being possibly trapped ( with only one double-glazed window in his room, with small opening, to smash and jump through ).
Having bought the First Alert 3-storey Escape Ladder I now sleep at night...it's kept under his bed with a hammer next to it (for the window!)- just in case.... at least he'd have a fighting chance now if anything were to happen. The unit is easily deployable once hooked over a window ledge... you just pull a velcro'd flap and the ladder automatically falls.
It arrived within 3 days and to check it out, & gain a bit of vital experience, I (together with my son) "deployed" it in my living-room. It was a fantastic piece of kit and carefully putting it back together was no problem with the enclosed instructions....which weren't really needed.
The cost - which doesn't come into it as far as peace of mind is concerned - was very reasonable I thought.... especially with regard to other makes of ladders for sale that appeared to be single-use ladders!