Really, not very good. Hard to generate any kind of empathy or sympathy with the characters, to the point that you just wish the killer would quickly despatch them all, get it over and done with so you can go do something much less irritating than watching this film. Talking of the killer; what a walking cliché of the genre. Mask wearing, mute and never in much of a hurry to get anywhere. Also, performs the old 'appear and disappear as if by magic' trick beloved of stalker films.
The script is weak at best and mainly consists of the characters sniping at each other with feeble, childish put-downs. This only adds to the irritation you feel for them. I'm not sure what they spent the props budget on, but it wasn't on props. Check out an iPod (thinly) disguised as some kind of tracking device! OK, so maybe you're not that concerned with quality props, great character development and a fizzy script and you just want a bit of mindless slasher thrill...well, don't look here. It's like something from a made for TV movie. Yes, sometimes less is more, but here, less is most definitely less. Check out 'Eden Lake' for some uncomfortable slasher moments, or 'Mum & Dad' for some really gruesome kicks. 'Steel Trap' may have had a limited budget, but 'Mum & Dad' was made for peanuts and totally eclipses it in every way.
There is, of course, a twist in the tail of 'Steel Trap'. I say 'of course', because you're already looking for it after a matter of minutes, once you realise the tired style, weak direction and general lacklustre nature of the film.
Also included is a 'making of' extra feature and it's as amateurish as the main feature, though some interviews were unintentionally funny and when you see the quality of the crew, you know why 'Steel Trap' is the way it is.