Besides they'll teach you to spin smooooth. Just like Phil's hubs, buy a set of Kreitlers and your grandkids will be able to train on them and probably their grandkids too. I need to replace the belt every 3-4 years and that's it. Just as an aside. I never could.
Rollers are definitely a roadie-only item.
I had my Kreitler's for about 2 days, had to take them back. Just about killed myself. This is, however, entirely due to my screwed up riding style. As far as rollers go the construction is definitely top notch, and I can see these easily lasting a lifetime. So if you're a roadie or roadie who does a little offroad, get these.