If you do not have foot problems, insoles are (IMO) a bad idea.

Insoles are great if you have problematic feet and use them correctly. All sorts of problematic feet out there, so that's not a huge if. Using insoles correctly is easy if you think about it. An insole will add extra thickness to the inside of your shoe. How much thickness is added (and where!) depends on the insole. This means that a slipon shoe (like oh, a loafer) won't behave right, unless you purchased it to go with a specific insole. A closed shoe (hiking boot, cycling shoe, oxford) retrofits more easily. Tying a closed shoe super-tight is a good way to give yourself more trouble, so don't *do* that .

Some closed shoes do not have an appropriate heel cup for an insole no matter what you do. Some closed shoes have a very flat, close to the sole vamp, which is bad for an awful lot of people. If a shoe fits badly and you add an insole, chances are the fit problems will get highlighted in a big way.

If an insole makes your feet hurt more, it's not doing it's job and can damage you. A good insole makes your feet feel at least a bit better right away, and it'll stay feeling good for a long time.