I have 2 Rhodesian Ridgebacks, the male is about 110 pounds and the female is about 85 pounds
They just had their first litter of puppies that all went to great new homes, it was a ton of work, but very rewarding.
I think Rhodesian Ridgebacks are a somewhat misunderstood breed.
They are large active dogs, and will take almost as much exercise as you can give them, but are fine with a 2 to 4 mile walk / jog once a day if that is all you can do & they are very happy to lay around the house like couch potatoes afterwards. They really do enjoy being able to sprint at full speed when they can.
If you raise them in a household, they are excellent around people and very friendly with children. My dogs are very friendly to people we meet out walking & don't have any problems with kids walking up to them to pet them. They will bark and warn you / get your attention if anyone / thing is coming towards your property they are not familiar with, but once they sense from you all is okay, they are very well behaved.
They are very intelligent and pick up on what you like and don't like very quickly & are very easy to train as long as you are consistent & are not a wimp.
They love as much attention and love as they can get and enjoy being petted endlessly & will tend to follow you all around the house and curl up beside you as you work on the computer etc.
One of the biggest advantages of them is that they hardly shed, so your house stays nice and clean. They do well in moderate heat, but do need to be indoors a lot of the time during winter.
They are not a dog breed for someone who wants to keep them chained up outside. They want to be part of your family and around you as much as possible, the ideal setting for them is to be indoors with free access to a yard. They love to sleep with you if you let them, both my adults normally sleep in bed with me & the puppies very quickly start trying to cuddle up with you when you go to sleep. They are ideal for someone who really loves being with the dogs and playing with them and giving them lots of attention.
You can spend tons of crazy money on them, but you don't have to. If you are concerned, see if the breeder has X-rays of the parents hips & if they have done the 2 genetic tests (one for hips / one for eyes). You can also if needed just have the main genetic tests done on the puppy themselves & you can have your vet check them out.
Usually in every litter there is one that doesn't have a complete or perfect ridge and you can usually get them much cheaper & they are perfectly good for a pet / companion.
One note is that if you want your dogs to be big, keep them all intact and natural. On average you will get about 10% bigger with a 15% bigger head on the males and the females will be a bit more assertive and active. They tend to hit a growth spurt around the 1 year mark and it can be around a year and a half before they get as big as they will.