In reply to simon1985:
Congratulations.
We had both the Arc 2 and a Phil & Ted Traveller (I think it is) - mainly because I was idly bidding on eBay and won both.
Used both indoors, in the garden and in a tent with varying degrees of success, depending on mood of little one.
The Arc 2 is smaller and lighter, but consequently less sturdy than the P&T - agree with the comment about tricky to get the poles in in a confined space. Bought it with a view to travelling, as can be easily packed in a holdall - particularly small if you leave the mattress behind and use whatever else you have available underneath it, or just stick it on the sand at the beach - you can get a sunshade for them.
Original owner had lost the mattress for the P&T one, so bought a Vango Trek short self-inflating mat as a replacement. The zip on the top can be a bit temperamental. Looks like they've moved on a couple of versions from the one we've got.
With any of them, just be careful with the feet/pole ends on your tent groundsheet/camping mats/etc.
Youngest is now 14 months and when we went camping last bank holiday, we didn't bother with the cots and just put her on a camping mattress - slept fine.