Try them on first if you can. The sizing is very small. IMHO
Not with the standard Kiwis it isn't, that's not my experience.
I always have 3 pair in my wardrobe, they are everyday wear for me. Below is what I wrote in a review on Amazon in March this year:
"My latest purchase....fit well on the waist (38") and leg length (33") but the thighs are voluminous. They'd be fine on Charles Atlas or a really chunky guy, but I'm sure I could possibly fit both of my slender legs in one trouser leg if I tried. It's like I've bought something from the outsize mens' shop."
And that is true to a greater or lesser extent of every pair I've ever bought.
EDIT: Oops, I tell a lie! I currently have 2 pairs of Kiwis and 1 pair of Trespass 'Clifton' trousers, the latter bought in January for a similar price. They are a nicer cut and fit IMO, though I already have a feeling that they won't have as long a life as the Kiwis.