Do insist on the chicks having a heat pack when shipped, unless it's actually hot.
For what size order?
I know they do orders as small as 3 chicks.
If you order 15 or more chicks, I would probably trust the hatchery's judgement about whether to use a heat pack, because that many chicks usually do fine keeping each other warm (which is why so many hatcheries set their minimum order at 15 or higher).
What are the Pro's and Con's of CackleHatchery.com? I've heard all good about them, but I just thought I'd ask!
Also, would you personally recommend them?
I've ordered from them once, and I was satisfied with my order.
I ordered 21 chicks, and received 22 alive (shipped to Virginia in late June, some years ago.)
I requested a particular ship date, and I said it was fine to substitute chicks if they didn't have quite the right ones for that date-- they refunded for 2 chicks they couldn't provide, substituted a few, and added an extra here and there.
The chicks did fine, although there were a few I certainly would not have wanted to use for breeding (like a Spitzhauben with a double toenail on one toe.)
None of the issues were things that caused trouble for the chickens themselves, and I've gotten about the same rate of not-quite-right when ordering rare breeds from other major hatcheries. The overall rate might be 1 or 2 in 10 that have something "wrong." (From other hatcheries, I've had wrong leg color, single combs in breeds that are supposed to have rose, feather stubs on legs that should be clean, muffs missing on a breed that's supposed to have them, etc.)