Anybody bit roller trainer

Hi all, with winter closing in, I'm looking to buy an indoor trainer, my heart says I want rollers, and the difficulty level is not my concern, but having read reviews that say they offer little resistance, and are more for technique , can anybody advise on this and give some pointers, also does anybody know of iPad apps that work with either turbo trainers or rollers to offer something to stave off being board
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parallel threads here, I'm favouring rollers to improve my technique and keep me more engaged. Cant answer about iphone apps but I'm looking at a cheap heart rate monitor to go with the winter evening training