Jack -- just out of curiosity, which distro are you testing with.. think you were partial to Kubuntu yea? Is it Kubuntu with the neon/kf5 PPA or the 14.10 beta? And how's the stability, good enough for general use yet or still keeping it to a VM? Last build I messed with was pretty wonky but it was a really early build too, tempted to check up on it again, curious if it's ready for a real desktop yet.
i am using the kubuntu nightly master packages, so i get the whole stuff updated daily. kinda bleeding edge, but not as stable as you would just use the project neon 5 iso.
however if you are really behind it, get the nightly stuff, and do bug reporting - there are still many out there, however more now so on the design level, for example missplaced icons like here:
or lately there is also a bug with k-launcher
generally i would avoid to use it daily, things like akonadi server are not yet implemented, so Kontact would not fully work, especially not the Kmail stuff.
give it a go in virtualbox i'd say, or do what i have done. run a default kubuntu 14.04.1 and then add the project neon ppas, that way you can chose from login what instance you wanna run (plasma or project neon). so when in the testing/bug-reporting mood, you login to project neon, when you need your daily work done, run plasma, which by now is amazingly stable and quite fast as well.