+1There's a huge difference be the Collection accessories and the MMK. I have several of both. I tend to get the MMK (and I have a lot, probably 20 or so) for fun colors (yellow, fuscia) or trendy asthetics (studs, grommets). But I'll go for the collection bags for more timeless and chic looks, like the Miranda).
I use my MMK (and Coach) bags for every day and to fill out the unique and fun colors (like sapphire and malachite), textures (like calf hair), and prints (like leopard) in my collection. I use my MK (and LV) bags for special occasions and timeless classics. I still want something with specchio and something with studs, but those will probably be purchases via the MMK line.