Yep, grew up on a farm in Australia with kelpies. They're great dogs and really lovely.

However, I've seen them appearing in the city a bit and that's just a terrible idea all round. They need much more space and stimulation than they can get off a farm.

They're challenging for sure and I don't recommend them to inexperienced/unprepared dog owners, but they can be amazing as pets! Very rewarding, especially once they get past the first year and a half or so. Then, if you've done well, you'll almost have your own language with these dogs and they'll understand almost everything you say to them. They're incredible. I may honestly never have a different breed of dog.

The huge 'BUT' is definitely everything you just said. They need outlets for their energy (even if it's just a hardcore game of fetch every day) and ways to engage their mind (Kong toys and smart balls do wonders for ours when it's raining) or they can be very anxious, destructive, and generally neurotic.