Does anybody have any experience of the toddler seats that fit on the hard-bodied carrycot prams? They're always available on ebay in very good condition and I'm wondering if they're a 5 minute wonder with people having problems with them after buying them. I'm interested to know how comfy the toddler really is in the seat and what's the best solution if it rains - a big rain poncho maybe? Any advice greatly received.