The reason I bought two is because I don't know how long I trust it to last if you're constantly swapping tips. The tip-retaining screw is tiny and looks like it's biting into plastic, so I don't think I'd expect that to last very long under heavy, repeated use.
For anyone who buys a #Pinecil and thinks, you know what, for a few extra bucks a clear case for this thing will look cool - you'll want this teardown from #iFixit: https://www.ifixit.com/Teardown/Pinecil+V2+Teardown/170774
The official instructions (https://wiki.pine64.org/images/0/01/Pinecil_Shell_Replacement_Guide.pdf) do not actually explain how to snap the case apart, but the iFixit guide suggests levering the halves apart by sticking a small screwdriver into the soldering tip hole.
Practice snapping the new shell open first, to get an idea for how it should feel.