Unfortunately in my experience it is very rare that I don't hear of a negative issue attached to using family and friends.
The person paying is never happy at the end of it.
All the disadvantages of knowing someone, without any reduction in price.
My friend was getting built in furniture some years ago and against the advice of her friends, her husband insisted on using his cousin.
The cousin kept dropping her job to do other small jobs that came up.
My friend was vicious with her husband and with the cousin.
The house was up in a heap with young children far longer than was agreed.
Eventually she cracked and there was an absolutely huge blow up.
The job took twice as long and my friend lost a lot of respect for her husband in the process.
She saw him as a wuss that was more concerned about his cousin than his own family.
This was a very expensive job too that they didn't save a penny on and was excruciating.
The fact that he did an excellent job was completely lost in the stress and annoyance.
Also the bad publicity amongst her friends meant that none of us would ever recommend him and would actual say not to go near him, he's a twat.
Needless to say, not a peep out of her husband on any further work being done in the house.