Firstly, as alluded to in the title, these changing parkas have just the right number of pockets and all are of a useful depth (nothing worse than a shallow pocket).
Pockets aside, the overall size of the robe is perfect for what it is. There is plenty of space inside so that I can easily get changed under it, but it also fits very nicely as an everyday jacket. A bit more bulky your standard jacket but when you consider that it's essentially 2 layers in 1, the bulk is more than justified. Wearing just the inner, it fits very nicely and is practically the same as just wearing a fleece. Wearing just the outer, it has a little less heft than when both layers are together but is still warm. If you wanted to reduce the bulk so it's more convenient while commuting, shopping, etc., you could comfortably get away with just going out with the outer layer on (unless it's especially cold or windy).
The versatility alone could justify the price tag, but the performance features definitely make it worth it. I'd recommend it to anyone who spends any time outdoors beyond commuting and trips to the pub.