Whilst my mh mattress is new it could be more comfortable, and I've been considering a Memory Foam topper. There seem to be plenty of cut price "Memory Foam" toppers on eBay, but I wonder if any in them are any good i.e. do they give added comfort in summer and winter? I'm not interested in Duvalay bags as we prefer a duvet and fitted sheet. Has anyone bought a cut price topper? If you have I'd be pleased to hear what you think. Thanks.