I agree with the general consensus that this is a good, if not great buy. My son has used the detached chair on a daily basis since birth and the swing has come in very handy from around the three month mark. In all fairness it is the swinging and vibrate motions that he responds to the most, the music and bird sounds he can take or leave. The effectiveness does vary depending on his moods though, as I would imagine it would with lots of babies, sometimes he'll enjoy it for 30mins plus, sometimes just a few minutes. But when he takes to it, he does so incredibly well.

However my one word of caution would be with regards to its size. We live in a small-ish flat and the full swing can take up a lot of room. Fortunately we have a spare room where we can keep the chair at night and when we have visitors round, but for those in a similar situation I would bare the 70cmx95 (aprox) dimensions in mind (plus additional room for the swing to reach back) when purchasing, especially if you have other children running around.