Bike Trainers?

Several days of rain had me wondering on how to keep biking during the
typhoon months. Any of you guys using or have experienced riding a bike on a trainer?

its no replacement, but will it satisfy your biking itch when its raining hard outside?
Know of any bang for the buck brands/models that might be good,
or any features that you'd recommend as a must have for them?

thanks guys! :)