We were looking for Mandarin Chinese lessons for our kids, but prefer for them to learn traditional Chinese characters. There are not many options for that particular combination either online or in person. But TutorMing had no problem accommodating our wishes.
They were also super flexible in letting us try out both 25min and 45min sessions. This is great, as it is so hard to predict how much stamina kids have.
We have had a total of four lessons so far, and the kids are loving the experience.
By necessity, we had an unusual amount of interactions with customer service, as we needed a few unusual changes. The biggest change was that our Chromebook was initially not supported by the app. I reported the problem, and I was blown away by how fast TutorMing's response was. It only took about four hours from my bug report and they had released a new version of the app that now fully supports Chromebooks. That's amazing! It's also really convenient, as Chromebooks are so popular with school kids these days.
I love how both for e-mail and phone customer support, I regularly get the same tech support person. This makes it easier, as I don't always have to repeat everything we talked about previously. That's so refreshing compared to the experience with most other companies. The only downside is that I can't get hold of customer support until the evening of California time. Not a big problem, but certainly something to keep in mind when reaching out for help.
We have used the TutorMind Android app, which appears to work great, and which also works fine on modern Chromebooks. At this time, TutorMing also has a Flash app (which doesn't seem to work on Chromebooks; or at least I haven't figured out how to use it) and they are in the process of switching to HTML5. Once that is done, things should work even better across even more devices. I believe there also is a iPhone app, but I have no way of testing that product.