I'm heavily biased towards rollers, but also know that the return rate is very high for first time buyers. It's due to a number of reasons. And so I'd do as much research and really think through the purchase before buying.
The biggest issue is simply lack of use. Roller workouts are very different from riding a trainer. Until you're really comfortable on them (and this can take weeks or even months for some folks) it can be rather difficult to ride longer than 30 minutes. Some people really like to be able to multitask when training indoors... watching a movie, or reading a book... things that are technically possible while riding rollers, but very tough at first.
Another reason that they can go unused is noise. If this is going to be a problem in your home, you should absolutely test them (or at least talk to someone with the model you're buying) beforehand. The PVC rollers are quieter than aluminum ones, and because they rattle less, non-folding quieter than folding.
Kreitler is the gold standard for rollers, and the one hand, I'd say that if you know you want roller for sure and have the money -- you might as well buy them, because they are the smoothest and longest lasting. On the other hand, if you don't know exactly what type you prefer (aluminum vs pvc, folding vs non, wide vs narrow, small diameter vs large) then you might want to go with a cheaper set.
Compared to Kreitler, virtually everything else is comparable. Personally, I would buy a set from a trusted local bike shop, where you can see and try them (or at least get some good, honest, specific advice about a given company/model) and get help if they don't perform to your expectations. Minoura makes a very popular folding set, and it's often claimed to be crummy. But if you make sure to install everything correctly, tightening everything down, and laying down a dampening cloth or rubber beneath the frame, and ensure that the wheelbase is perfect -- they're actually fine. They're inexpensive, easy to learn on, very light weight, foldable, and now come in both wide and narrow widths. But the Cyclops/Nashbar/Elite rollers aren't bad either. I especially like the non-folding Nashbar rollers, which are far less convenient than the Minouras, but a bit quieter.
That was good knowledge, thanks for sharing. I never considered the noise factor and I live on the third floor of a three flat. Do you think aluminum rollers would be to loud for the girl below me?
I am more interested in rollers bc I enjoy the interactive part i.e. you have be alert or you can take a painful spill rather than being locked into a trainer.