Major latency. Not sure if it is the app itself trying to do too much or the servers on the back end that are slow....really affects performance. Last page memory. There is no ability to keep your place in the app when you navigate to another screen. Again, poor coding here. Login ID. The app does not remember authentication, particularly if you try to schedule at another studio. Now, there are issues with cross studio membership that contribute to this, but, the app lets you "think" you can do that. It should not allow visibility at all if there is no way to actually schedule a class at another location. Monthly fees and scheduling. The fee are high (though, a decent value of you go a lot), however, given that they are month to month (really 2 months because of the 30 day notice policy to cancel), when the end of the membership month approaches, the app wont let you schedule beyond that date. Again, a function on their membership policy and system, however, the system knows who can or cant cancel on the particular end of month and allow those who cant cancel (meaning they did not provide 30 day notice) the ability to schedule classes in the app. This causes a problem because class sizes often lock you out if you dont schedule soon enough. That is all for now....plenty. There are some great features (scheduling of classes, review of charges, attendance history) which is why these other deficiencies are so annoying. A decent build that has potential but does not hit the mark.