Trimurtisan
Flying by the seat of my pants!
Well that's a loaded question!how about guineas? what are they like?

I was not a fan of raising guinea keets. My first go with baby birds was 5 keets, and 8 ducklings, raised together.
I don't have any real complaints, or warnings to speak of... Okay I guess I do. They are very fast. That might not be a problem for some, but I didn't know that at the time. They can also fly from an early age. If you've never tried to catch a guinea keet, it's nothing like trying to catch a duckling.
Now that our guinea is older, I doubt I could EVER catch it, but I do like them. They are loud when spooked, but that is one of the main reason I got them. They can be very funny, but are surely not a bird for everyone.
If you want to get some, I would suggest visiting a farm with adult guineas and watch them for a bit. The farm I got my keets from, had some very awesome adults. They would come when called, their running motion is cute to watch, and they are very different looking.
Although they are "great" at preventing hawk attacks, that does not go for the keets/juveniles. I had 2 get pulled out of a parrot cage at the same time. There was only 1 hawk though! I can understand 1 getting being a victim, but this hawk got 2, in 5 minutes... Predator savvy in the open? Sure. Dumb as a box of rocks in a cage? I think so! I mean, they had to be right next to the cage wall for the hawk (it was a juvenile also, smaller head) to even be able to touch them.
That being said, if you are interested in guinea fowl, I would suggest educating yourself on them. I do like them, just not raising them from day old keets.
Oh yeah, they are super strong. Ours are about the size of a nerf football, and can be difficult to hold on to. The typical scoop and cradle motion I use on my chickens does not work on them. They tuck their legs up pretty high, and get them in my hand and can almost break my grip. I ended up just doing like a side scoop, and holding them against my chest if I need to move them with one hand "petting" them in case those wings come out that are also very strong. If they feel secure, it's not that bad/hard, but they do spook pretty easily...
Anyhow, that's my 2 cents on them.