I've got about 1200-miles on mine now, and do not find the sidewinds a problem. Yes, you do need to be alert, but you should be when driving any car. I have not found it to be tiring. Wind noise very much depends on the direction of the wind, though - sometimes, it is quiet, sometimes it is not. But, again, considering what it was designed for (not what some people use it for, especially with the REx) - low-speed, running around town or the reasonable commute, I do not think adding extra pounds to include more soundproofing, or messing with the body style (would likely result in less headroom and useable shoulder space) is a worthwhile modification.
I've had one glitch so far - the charging plug would not release when unlocking the car...I had to use the emergency release. It has worked fine since, with no idea why it happened. When that happened, the car stopped updating information to the server, so the remote app was useless...I ended up having the dealer unplug and replug the telemetrics module's power/data cord and it immediately started to work again after multiple account resets and forced vehicle data updates had had no effect. I asked what fuse powers that module, but was told by the I-concierge that was not a good idea as it could be powering other modules as well. I asked if it was powering other modules, or they just thought it was and they could not answer...people, it either is, or it isn't...I haven't found out yet.
As an aside, I went to pick up a new set of winter tires, and they had sent four of them mounted to fit on the left side of the car! If you elect to get some, make sure that you get a proper set. The dealer is flipping the tires on the wheels, and I should be able to pick them up tomorrow, but it should never have happened. Be very careful on any directional tire - if it has a rotation arrow, or something that says, this side out, make sure it is!