I went for MONA LISA (in the set with LGF) because I didn't have it on Blu-ray and, by all accounts, the transfers of both are supposed to be great but I'm totally with you, Nos - I buy 85-90% of TT's releases, I buy a lot of Kino, Shout! and Criterion releases too, so there's almost never any need to double dip as those companies are releasing product of a generally high standard to begin with.
You really can't fault Arrow for its effort in producing quality a/v these days, it's just a shame that a lot of their work does seem to be cashing-in on the hard efforts of others who've taken a risk - and without having to resort to crowd-funding projects, either