How much have you driven it? It seemed to me to quiet down after the first 50 miles or so and if you mash & lift off the accelerator also seems to determine how pronounced the shifting "feels", when your standing on the gas it will shift with authority same if you take you foot off the gas entirely.
Exercise a little moderation and technique and it is as smooth as can be. You can drive it like you stole it, your machine but if you drive it like you paid for it you will likely have a better experience.
I can't comment about the heater performance or lack thereof, I would think it may take up 15-20 minutes to get to full operating temp, and one should realize it is not sealed off and insulated like an on road vehicle so its bound to have opening causing drafts, I would think the heater would be designed to keep you comfortable as long as you are dressed for the weather outside, it will not keep you warm at 20 degrees wearing a T-shirt and pajama pants like your vehicle will once warmed up.