I have the Palm Mini Paddle, and the Palm PPK for back-up. I use the Palm Mini Paddle on nearly all activations.
Last year I hit an unknown combination of keys whilst on an activation, and couldn’t get the Mini Paddle working at the time, so I had to rely on the Palm PPK - boy was I glad I had it with me. I sorted out the Mini Paddle when I got home.
I learnt on a straight key before going to sea, so can send on one comfortably at 20-22 WPM, but I was a bit slower on this one at about 16-17 WPM, so it did the job and saved the day. Whilst it is small, light and compact, and is great for SOTA, I prefer a bigger key.
The Czech army key above has a nice action, although I would prefer a different knob. The best morse key know I ever found is the one on the British Air Ministry Bathtub and Type “D” morse keys, but that’s only my personal preference.