friday1970 has a very good point. Depends on your goal. I use a Racermate II, which is so old I can't find an image of it via a duckduckgo search. (Google would probably find one for sale.) It allows me to keep some aerobic capacity going in the winter, and even a 20 minutes a week prepares me to keep pedaling (rather than pedal-coast-pedal-coast) when I first hit the road in the Spring. It also keeps my butt broken in, so I don't have to deal with that pain when the weather gets good. But I'll be happy with 1500 miles this year. The trainer does what I want done.

If I were doing bigger rides or racing, I'd want to get the riding skill that rollers help develop.