Been using this keyboard semi-regularly for the past 4 months now, only charged once when I first got it so it has yet to run the battery dry. It's light, maybe around the weight of a smartphone and about 1.5x bigger when folded. It's not gonna fit in your pants pocket but does fit snugly in my tablet case when packed. Keys are full sized but short, a little over 1mm of travel with a crisp but quiet press, no mush. Feels like a good laptop keyboard, but might be unfamiliar if you're used to chunkier keys. Bluetooth switching is pretty fast, I think this depends more on your devices though. I don't usually write reviews, but the customer service was massively helpful and convinced me that this is a product that has some care put into it. The keyboard recently developed some non-functional keys, and once I contacted ProtoArc support they sent me steps to see if it could be fixed, and when that didn't work they promptly sent me a replacement XK01, free of charge. All that took place in less than 3 days, with delivery taking another 2. If that's not above and beyond service then I don't know what is. On sale, this is almost a steal.
