I've had a few, the USE ones are my personal favourite.
I quite like them, they do take some of the harshness out of the ride (I assume we're talking about fitting one to a hardtail frame here?), and if you'd rather add a few grammes to gain some comfort then they're worth a look (along with a comfier saddle??).
Keep on top of the maintainence and they should last a long time, although I found that over time they all seemed to develop a bit of movement, probably down to the bushes wearing or something, but it noever got bad enough to bother me whilst riding, more something I noticed when fettling in the man cave.
Give it a go I say, she might like it.