OK, did a 10 miler dawdle with the wife and kids yesterday. The wife couldn't decide whether to laugh at all my new kit ("you never do anything by half do you Mick") or worry about the SPDs. The Planet X socks with coloured cycles on them tipped the balance so we had a worry free ride.
No problem at all clipping in or out, actually it felt totally natural immediately. Grateful for the tip "program your brain/feet that they need to twist out in an emergency". I think that works well. I did that by picking a random stimulus( in my case whenever I saw a bird) and immediately unclipped.
Did that for 10 mins till I got fed up. Later when one of the kids stopped suddenly in front of me I unclipped without thinking about it, after I'd braked then started to topple.
Pedals and cleats are Shimano M530. I have nothing to compare them to but they seem to suit me very well as a beginner.
... every day is a winding road...