I've had the Picopresso for about 4 months now. It took me a while to dial it in and get the workflow right. I use it in my coworking space most days and also took it on a hike, the results are incredibly consistent. I did some test runs at home with a scale to know how many times I need to pump to get to my target output, for me that's 10 for preinfusion and 20 more to get ~34g out. I'm using 17g and a puck screen. Without puck screen I'd use 18g.
It's worth noting that you absolutely need a capable espresso focused hand grinder (1ZPresso JE-Plus in my case). I tried with a pour-over focussed hand grinder (1ZPresso JX) but all you'll get is battery acid. So, if you don't already have a hand grinder for espresso, that will likely more than double the cost.
Also, especially for several shots back to back, the Picopresso body gets very hot, so you may want to get some form of sleeve. I cut a bamboo sushi rolling mat to size, removed a couple of bamboo sticks and tied up the ends, it fits perfectly around the Picopresso and it still fits into the carry case.
Taking it to weird places, for really boiling water you can always get a mini camping kettle/pot stove, mine holds ~500ml (also enough for two Aeropress cups) and can run on solid methanol fuel tablets or other solid fuels. It's a similar size as the Picopresso and very light. To speed up the boiling time bring hot water in a thermos.
It's kind of weird pulling out a hand grinder and espresso maker on a mountain or a beach, but these are also some of the most memorable shots I ever had, and somehow that environment makes them taste even better.
It's also a cheaper entry point to espresso, just be prepared that it's a steep learning curve, so don't give up easily. If it doesn't taste good and you're inexperienced, it's probably you (or the grinder) that's to blame.