.. no interest in (buying, or feeding) a slide fire. It would be nothing more than an expensive, unremarkable experience.
The real question is "can you get good at aimed fire with a slide-fire stock". If you can get almost as good as someone using 3-burst on an M16, with practice, I'd think they could be useful in certain situations. Some people turn their noses up at magazines with more than 5 rounds, claiming that's not really useful for average Joe gun owner. We have to use what we have. Slide-fire is legal and (apparently, because I haven't tried one) works.