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I've had a consistently unpleasant experience with these... even in our new build with perfectly solid plasterboard walls, they have a tendency to pull out and gouge huge holes in the wall. They also leave colossal holes (at least for the larger size ones) which are a pain to patch.
I've now replaced all of these (where they existed) in our house with hollow wall anchors. Much easier to set, much more solid.
Soul-
When I lived in place that had fake walls (tm) I've had success with toggle bolts for putting up shelves and whatnot.
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The only comment with hollow wall anchors - which is obvious in hindsight, but not something I initially cottoned onto - is that they need at least the full depth of the anchor behind the plasterboard for them to seat properly, otherwise they just crush and collapse.
Howard
branwen
How fucked is the plasterboard?
Gripit fixings are good. You'll need a spade bit to use them though.