we just got one, we were on a tight budget so went for the cheapest argos one (??26.99), and we really liked it, easy to put up and down, has a mattress, (watch out we went to babies r us and you had to buy a separate mattress to go with their one!
I second the argos one. We have 2 of them, one to keep at my dad's & the other one is for if we go travelling. It looks pretty comfy & DD sleeps through everytime she's slept in it.
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ds slept well on it, so must be comfy enough xx
Jxx