Repeating MS1 after having already gone through it is one thing. You/your poll question is assuming that you can read all the required reading of an MS1 year and gain roughly the same knowledge. This is simply not the case. You're better off making a poll (or even better, searching for past threads as it has most likely been discussed) reading: "In hindsight, would pre-studying have made any difference in M1?" I can assure you that most people reading the poll were approaching your question under the hypothetical of either (a)failing and being forced to repeat the year or (b)just having to do it again after having already gone it.
I think what people haven't told you yet is that med school, at least the first two years, doesn't live up to the hype. People have referred to it as "the Mt. Everest for nerds" but in reality, you're not going to working/studying 16hrs a day everyday. I was an Econ major that took 2 years off to teach in Las Vegas after college. The first two years of med school, after having a real job, is a never ending vacation. If you go to every class and study immediately afterwards like you should theoretically do, you'd still have enough time to pick up hobbies and such. Point being: very rarely is mastering content an issue in medical school. If you have enough discipline to seriously considering pre-studying then studying for classes will not be an issue. Medical knowledge in the basic sciences isn't rocket science...I know people that struggle on tests sometimes but it's not because they had spent hours and hours studying and still don't get it.
Anyway, I hope we've all been of at least some help. Keep in mind that SDN is a community of individuals in the medical field. This means that the people replying to your queries are your peers and most likely a pretty good sample of the people you will meet in school and in your journey towards becoming a doctor. Taking our advice with a grain of salt is good and all...but hopefully after your M1 year you'll realize the worth of listening to overwhelming consensus.