I agree, JammedStab, that it is something that needs close attention. Guys have also busted check rides because they are vectored inside the CF on an ILS and they fail to extend the centerline from the FF. If you were on a downwind leg to base and you were vectored inside the wayline of the CF, the CF would never cycle, but you might not notice because you are intercepting the ILS and at that point most guys are concentrating on that. If you get to DA like this, it begs the check airman to command a go-around so he can enjoy the confusion as you get to 400' and select LNAV. Instead of following the missed approach route, it wants to do a 180 back to the CF. So, your last sentence is important -- Always make sure you have the right fix in front of you.