My friend has just bought one of those Phil & Teds ones and she really likes it . It packs up really small (about the size of a packed up sleeping bag) which is what they wanted. The down side is that it takes quite a while to assemble and dismantle it, much longer than a standard portacot. This isn't a problem if you are keeping it up most of the time, but it can be a bit of a pain when you only need it for one sleep.

HTH