This is my comparison of various recipes...
Settled for this one at Not so Humble Pie after three failures with a swiss macaron and the I Heart Macarons book.
I aged my egg whites in the refrigerator for 3-6 days and skipped the dehydrated egg whites this time as I forgot to buy them.
Added some lemon juice when whisking the egg whites at early stage and used the whisk attachment from my good old Braun Multiquick hand blender as I wanted a really slow speed.
Vanilla Bean Buttercream recipe from Tartelette