I noticed the weight increase and same old sRGB gamut within 30 seconds of unboxing my rMini. Neither is a deal breaker, although I personally would have preferred a full sRGB gamut.
I can see how someone would perceive increased thickness due to the weight increase. There is a density to the rMini that makes it feel thicker in the hand. The effect is particularly noticeable when you've used a Wi-Fi only model and switched to an LTE rMini, which adds the weight of the cellular radio.
I still like the rMini, and will use it when I travel by air (no pun intended). I'll use the Air most of the time though. To me it feels better in the hand, and the color gamut is better, which I want due to editing photos being one of my primary use cases.