Does it play well with lazy?

Yes, in fact the motivation for putting it in Class::MOP was to support the 'lazy_build' option in Moose (which is sort of documented in Moose::Meta::Attribute under "is_lazy_build", more docs to come, patches welcome and all that).

In general if an option does not play well with another option, we consider it a "syntax" error and throw an exception at compile time.

has foo => (
    ...
    lazy_build => 1,
);

sub _build_foo {
    my $self = shift;

    ...
}
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