I really like them
But as Mark said they take cleaning and prep work. Make sure to test fit everything.
I have built several Pro Stock Hemis and one injected 392.
I gave one as a gift to a friend and he did not care for it. Just not his cup of tea.
The other thing I see is the Hemi is a bit larger then most kit motors and can cause fit up issues but nothing that can't be fixed.
I think they look great.