I just got mine.The plastic side cutting feels a bit unrefined but the rest is quite okay.It feels like it's sturdy enough for me.It needed some working before it switched open nicely like a proper switch-blade knife.Everyone should note that the cheap blank keys are made from steel, not brass.
I went through a bunch of cutters:
1.Stopped cutting keys
2.Doesn't cut steel keys, just brass ones.
3.Closed, checked back later, still closed.The timetable on the door said it's open, there was no note.
4.Doesn't cut Lexus keys (yet).
5.Homepage says they close at 7 pm, note on the door says they close at 6 pm (was there at 6.30, damn).
Better luck next time.