I am struggling to understand without further information how this will help the average owner from where he is at the moment.
Moving an aircraft to a EASA permit all annual maintenance will still have to be done to the same standard as at present and any Mods will still have to be authorised by EASA instead of the CAA.
All that it seems to to be doing is swapping one regulatory body to another with not a lot of financial gain to me. All it seems to be doing is shifting the admin to the LAA.
Further information is; that in subsequent years I will only have to pay the permit renewal fee to the LAA + fee to the LAA inspector - this is cheaper that paying an annual fee to CAA and cheaper than paying an LAE to perform/signoff my annual and I no longer have to pay a CAMO.
It also allows for parts to be made, still in accordance with good engineering practice etc, but without needing a form 1.
So the only downside would be that I have to get MODS approved by EASA, But why would I want to mod a well designed aeroplane. Avionic changes can be signed off by local Inspector .
As for standards - there is only one standard of airworthiness. Its either airworthy or not. There is no lower standard of airworthiness for a PtF than for a CofA. I will still work on the aircraft to the same standard - but now instead of an LAE inspecting I have an LAA inspector, if anything they can be more "nitpicking".
Enjoy everything - Life is Short.