Pentalite arrived today! Just put it up in the garden, goes up really easily, same for packing down - sensible bag with a bit of extra room. Plenty of room inside, including head room.
Minor criticisms - storm poles have some sort of ‘teat’ type design at the bottom end, which I can’t see going into gravel or hard ground particularly well. Also, a rod retaining Velcro flap would be nice...