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Never used it, I doubt it's easier than the best techniques but the best techniques require experience, tools and materials that you're unlikely to arrive at by chance. It's the kind of thing you might keep in a box for odd occasions when it's easier to use than the alternatives.
If you need to key gloss surfaces to paint them, get some of the sanding pads (foam with grit embedded) in different grits (60,120) and maybe some cloth backed non clogging sandpaper around 100 grit. You only need to knock the gloss off the paint and de nib it. Then use Zinsser 123 (blue tin) primer, a thin coat should do it (mix it well with a stick before and while using it). That is the easiest way I've found to do it. There are still lots of things that can go wrong but it's a very big subject.
Airhead-
Cheers. I've been using a multitool with a sanding head on which is messy work (and seems to go through the sanding sheets pretty quickly, anyone any suggestions for reasonable priced replacement sheets?). I'll have a look at the sanding pads.
I'm thinking mainly of doorframes, window frames and the like with lots of mouldings where sanding is a bit awkward and thought that stuff may be easier to slop on.
aggi
Does this liquid sanding stuff work? Is it any less messy/hard work than normal sanding. I've got a load of gloss stuff that needs painting and sanding down window frames and shit is a ballache.