Do you have a type of shade you can't seem to walk past?
For me...well as far as nail polish shades are concerned I can not pass up on a good cornflower blue,
I'm obsessed and own a good few and do still feel there is room in my collection for a few more.
In fairness this too shall past as last year I was all about neon pink polish haha!

Essie Lapiz of Luxury is of course a cornflower blue, a lovely mix of blue and lilac 
and the perfect option for those like myself who don't really like full on blue shades.
I will be the first to admit that Essie Lapiz of Luxury is not a completely original shade
for instance it is pretty similar to China Glaze Secret Peri-Winkle
but i'm sure you will agree that it is a lovely fresh shade none the less.

As far as my experience with the Essie Diffusion line has went this has to be one 
of the the thinner formulated shades and does streak quite easily.
To get full opaque coverage I found this shade to require three coats 
but as with the other shades in the range the layers did dry fairly quickly
and once dry Lapiz of Luxury has a soft sheen finish that is typical of a crème polish.
If you have read the other reviews you will know I hate the brush in the diffusion line,
the brush is too broad and makes a holy mess of things in my opinion anyway.

Have you picked up any of the shades from the Essie Diffusion line?

Essie diffusion polishes £7.99/15ml available from selected Boots and Superdrugs
but currently on a 3 for 2 via Superdrug - link.

Nail Polish Disclaimer - I will no longer be commenting on the wear of nail polishes
unless it chips instantly etc as I change my nail colour too frequently (sometimes daily),
to comment properly on the wear and as we all use different techniques such as top coats/base coats
I don't feel that my comments on wear time are helpful in any way.