Here is a caution. Nearly everyone has an embarrassing crash with clipless pedals initially. What happens is you go into a stop, you forget to unclip. So here you are stopped and still fastened to your pedals. You manage to get your foot out but by then your weight has shifted to the wrong side and you are slowly tipping over the wrong way.
One way to prevent this, is to practice clipping in and clipping out on a short tool up ride. But you will probably forget to do it anyway.
It was worse with toe-clips and straps. If you were wearing normal shoes you could probably yank a foot out even with the straps cinched tight, but if you were wearing cleated shoes with slots and you didn't remember to loosen the strap you would be out of luck. I remember one time when I forgot to loosen the straps. I was doing a track-stand at a red light, started to lose my balance, and tried to pull a foot out. Since the straps were cinched tight and I was wearing cleats, my foot didn't budge. And since I was at a stand-still and already losing my balance, there was no way to reach down with one hand to loosen the strap. I just braced myself for what I knew was coming, and fell right over
Fortunately the only serious bruising was to my pride. Not long after that I bought a pair of TIME clipless pedals and shoes. It was pretty nice to not have to deal with the straps anymore, and I was always able to get my foot loose if I started to fall over, but you're right that clipless pedals still take practice to make sure you can get out of them in a hurry when you need to.
Sean