For me, they're definitely a worthwhile addition... feels much more secure and efficient, and given my experiences yesterday I think I've already cracked the fear of not being able to un-clip and falling over!
Managed to get out this afternoon for my 15 mile "round the Hillfoots" route and smashed my previous best time by 4 minutes, and increased my average to 16.5mph
Now need to have an early night so I can be at Lidl's bright and early tomorrow to grab some bargains