From another thread, "The Harbor Freight $30 set has a pretty good mix and for $30 you really can't complain, but watch out as the chrome is so cheap that it can flake off and leave you with a nasty tiny sliver. Ask me how I know."
Having cheap tools at hand, by the side of the road, is better than having professional grade at home. Why stand there cussing when all you need is pliers or a screwdriver? For the last 30+ years I have made sure there are tools in every vehicle. My kids', the wife's, my Tacoma and needless to say, the Birkin. Some are cheap sets, but not used for 10 years. Cheap insurance. Goes with teaching a daughter to change a tire.
Cheap tools have come a long way. They are not as crappy as they used to be. A pro mechanic needs tools that can take hard work for years, but as an amateur, some tools might only get used rarely, so it may take years to wear them out. There are exemptions. Cheap wire strippers are not worth having; some cheap pliers are OK, others not, etc.
And don't forget road finds and garage sales. I have a ridiculous number of sockets, from a garage sale. Just about every 1/32 and 1/64 difference there is, bought in a gallon pail. Broken Craftsmen 1/2 inch breaker bar found in the road, traded by Sears for brand new one.