We’ve used ours since about then. At first, I always put her in it at points when she was about to fall asleep for a daytime nap, or when she was obviously desperate for a nap but not going to sleep.
She did grump a little bit sometimes when going down for her sleep, but not for long, and probably less than if i’d been trying to get her to sleep in the pushchair or sling. To be honest though, we may have lucked out – it always seemed a bit like a baby version of ‘speed’, she needed constant movement in order to sleep. I found she slept really well in it, but woke up the moment I stopped at home.
I did always come home when she woke up, but with two naps and planning that allowed some pretty long rides, I used it as my main transport for things like going swimming 8 miles away over the hills, or the 10 miles into Derby for clothes shopping.
By about 10 months she worked out that the magic sleep machine was also quite fun when awake, probably because she’d had such comfortable naps in it, but until then I never put her in it unless she was going to sleep.