Gait analysis. What to expect?

Shoe ratings don't really mean much, when you (as an individual) are getting fitted. What matters, is you having the right shoe for your running / gait needs. Not everyone that is an over-pronator needs a stability shoe. Not every x gait based shoe is created equal. Some can cause more problems than anything.

As to what to expect...

1) You should be promptly greeted when you enter the store.
2) If the employee doesn't take the time to ask about your background and knowledge of shoes etc. before the actual gait analysis, it is time to find another store.
3) Ask the employee about his or her background. Is this person a runner? How long has this person been working at the store, and how long does this person spend in making sure that a person is properly fitted for shoes?
4) A gait analysis should last more than 5 minutes. Ideally, the analysis would be filming you running in neutral shoes that they should provide. I also think the analysis should be outside the store and not just on 1 minute on the treadmill.
5. If the employee doesn't bring you different brands and sizes, and looks to fit you into one particular shoe, time to go elsewhere. A knowledgeable running employee should know that (generally speaking) it is best to get at least 1/2 half size up from what you normally wear, as your feet tend to swell during long runs.
6. A store that cares about placing people in the proper shoe will have a good return policy. Ask the employee what the policy is before purchasing any shoes, and make sure the policy is in writing.
7. A store that cares about placing people in the proper shoe will encourage you to take the shoes for a short run outside the store. You can't really tell much taking a few walking steps inside the store.
8. If during the run the shoes hurt your foot in any way, time to try something else. A quality shoe that is made for the type gait you have (generally speaking) should feel comfortable, fit like a glove, and feel as it you could wear them all day long. They shouldn't need a break in period before the pain of wearing new shoes goes away.
9. A lot of employees try to sell runners the most expensive / popular shoe, because it is quick for them and easy profit.
10. Don't be afraid to ask about last year's models, which can save you a lot of money.
11. Ask if the store price matches. A good store will do that, whether it be Amazon, or some other local running store.
12. Don't be afraid to walk out the store if you feel pressure or disrespect from the employee.
13. There is nothing wrong with getting a gait analysis done and then purchasing the shoes elsewhere at a cheaper price, if the store won't price match. A lot of running stores charge full retail for their shoes. No need to pay full retail, even if they do offer a good return policy.

In my opinion, your gait analysis and getting fitted with the right shoes for your needs and budget should take at least 30 minutes.