What's Your Experience with Trundle Beds?

The conversation on bunk beds got us thinking. Most people are for them, but some have had bad experiences with tucking the kids in at night, changing the sheets, or even falling off. So my question is, what's your experience with trundle beds as a semi-permanent solution for two children in a tiny room?

We're thinking about this for our almost 3 and 5 year olds. When they both are old enough for a bunk bed, we could keep this piece, buy a separate loft and have them in an L configuration.

Is the bottom trundle enough of a space of one's own for a small child, or does the little one always get short shrift?

Did any of you grow up with this kind of situation as a child, or do you use it now in your home with your kids?

(Image: Oeuf Sparrow Twin/Trundle Bed)