Just got my second set of retainers from Sporting Smiles and they fit great. I was a little skeptical at first about ordering retainers online. My dentist wanted $500 and I seemed way too much for a little piece of plastic. I saw sporting smiles had a bunch of good reviews and a guarantee so I figured I would give them a try. I took upper and lower impressions and the lower was good, but I messed up on the upper the first time. I called and they told me what I did wrong. There were spare supplies included and I was able to get a good upper the second time.
I sent everything back and it did take about 2 weeks to get the retainers back. The retainers were nice and clear and fit perfectly. I was amazed at how easy it was and how I saved about 400$ ordering online. I wore the retainer for about a month with no issues and got an email that I could order a second without having to take the impression again. I decided it was a good idea to have a backup and not have to mess with taking an impression again. The material seems to very exactly the same as what my dentist was using. Ordering online is a great way to same move and not have to make 2 trips to the dentist to get retainers.