I like the rab but the womens is unavailable with a right zip fixing, this seems worth a try.
I cannot find a Rab Neutrino Endurance slleping bag, sorry for that. So I cannot compare it with this sleeping bag. I just can tell you the sleeping bags from Valandre are State of the Art and really reliable sleeping bags. Unfortunately we don't have them on stock now, but they will come back on stock soon