for those of us in the northern climates ----> what do you hope to attain in the off season? do you want to build strength on the bike or can you get that through squating and other lifting programs? do you want to keep/maintain fitness?! i have used trainers almost exclusively for many off-seasons and do feel energized the first weeks on the road.
i feel that it is possible to have poor posture, poor pedaling technique while on most trainers. rollers help you with that smooth pedal stroke. i'd like to increase my cadence in particular gears and work on 'pedaling in circles' and keep a level of fitness when it is wet or dark out (otherwise i'll ride even if it is 10 degrees out)
i am considering buying a roller unit for this winter to keep my gains and improve on other things.