thats how I carry mine. Active battery and carto in hand, mouth or hanging on lanyard, charging/fresh battery and 2 cartos in the pcc. Reviews, I love it. I did see at least one person complaining they thought it felt like a cheap toy, which I can see if they were expecting an iphone. In case it's not obvious to you, there is no glass screen, the thing doesn't weigh very much, and yes it's made of plastic. If you are expecting a $500 piece of gadgetry it will feel cheap. That thought never crossed my mind until well after I had mine and read those comments, I think it's great. After reading them and considering it, I guess some people have way higher standards than I do. Some have complained of peeling or such, but I THINK I read that was an early model and the issue was resolved? About the only complaint I have is that the number of bars in the lcd display isn't enough, I don't remember, but I think it's only 3 bars? and the first one means it's dead? Small complaint really, but more like 6 bars would be much more helpful.
Honestly I've been considering getting a 102 for the house, but would never consider carrying anything bigger than the minis with me, they are just too convenient, analog like, and even hands-free vapable.
I considered the other style PCC and after imagining the dimensions decided against it. In practice my PCC spends most of it's time in a back pack, a car, the house sitting on a desk, etc, but I want to be able to stick it in my pocket and rockit, and the minipcc fits the bill nicely. For my needs the mini-pcc and the mini bats are by far the best option.
(I will add that my mini-pcc is a supposedly identical generic one bought elsewhere during the stock crisis, and the LCD is totally wonky and near worthless, sometimes if I press on it just right I can get it to display correctly, this has left me batteryless for a very brief period of time when it wasn't charged and I thought it was)
ETA, I have since seen some reasoning that might have appealed to me had I thought of it before buying and settling into my routine. The idea is that the same money spent on a PCC can buy more batteries and carrying extra charged batteries is more convenient smaller and lighter than carrying a PCC. There is good logic there, but my biggest worry is what if I forget to charge? What if the charger died and I thought it was charging? What if a fuse blew in the night and there was no juice to the outlet? IF the lcd works, the PCC resolves those fears for me, since my PCC (nonbloog remember) doesn't have a working lcd anymore, the multi-bat solution seems equally reasonable.