I got one incoming currently to try out myself and mess around with a bit at the range. I plan to try it on grouse and maybe other small game this season in a mock survival situation and see how it does.
For what it is, I think it's pretty cool. It's a very, very simple, lightweight single shot takedown survival rifle, similar in theory to an AR7, minus the magazine. It is not meant to have all the comforts and adjustability of a full size carbine or rifle, or their extended range capability. I plan to shoot this at 100m and in the vast majority of the time.
The trigger on the Stowaway is not great from what I hear. I have heard that from pretty much every owner I have talked to about it. That sucks but I will have to see for myself just how bad it is.
They do offer a 1913 picatinny stock adaptor so you can change the stock out to something more substantial and as Donkin showed already, you can easily make a handguard or heat shield for better ergos. With calibers like 5.7 and 9mm available now and the .22lr and .17HMR coming soon for affordable prices, I think it's a cool little rig. The 9mm conversion costs $199.99usd on their site, so I imagine the .22lr will be similar, maybe a bit cheaper.
It is truly unfortunate we cannot have suppressors here because this would shine in that use and is what most guys use it with in the US. There's some cool builds online I have seen of these things.