I started off using the hug-a-bub, which I still use sometimes, and then I made a sling using the instructions from Handmade Home. The hug-a-bug is easier on my back, but takes a little longer to put on. My homemade sling is so easy to pop on and off, but after a few hours can cause a little strain.
My weekly day in town is so much easier with a sling. I can even sit down for a cup of tea and Violet remains asleep all cozy in the sling. Every morning I pop her in and walk Luca and Julia to school. I still own a pram, but it can be so cumbersome. So I only use it when I have to, such as lunch dates.