I love my HD foundation but am now seriously lemming F&B after reading this thread! HD I found a little tricky to apply but after experimenting with what works well on the skin for easy application it's amazing.
I just bought the HD Elixir off of eBay and can't wait to try this...I'm currently using Smashbox primer atm which makes my HD glide on and blend perfectly. I have the HD primers (green and yellow) but I can't seem to get them to work for me. I end up with blotchy patches of that stuff on my cheeks when I try to apply it.
Oh and I have combo skin - oily t-zone, nose, cheek area on either side of my nose, dry areas on my cheeks and forehead and I break out VERY easily - HD hasn't made me break out especially when teamed up with Smashbox primer (this helps a lot with the dry areas). But saying that, I do use Proactiv cleanser and repairing lotion + Clinique Moisture Surge every morning and night, although other foundations/primers have still caused breakouts while using it.
I have been using my MAC foundation brush to apply and kabuki to blend a little. I'm waiting on the 109 brush in the mail after seeing gorgeous DRBrooklyn730's video (youtube) on one way to apply HD - I tried to make a clickable link to that video but it ends up putting the whole video in this post and wasn't sure if that was allowed in these threads
Will definitely post here when my elixir arrives!