if you run a gym what software do you use for billing/scheduling

curious what the standard is

We've been stuck with mindbody because the box owner insists it's what everyone uses, but it's been a headache. The members keep saying the app's layout is a maze and, every now and then the billing just decides to take a holiday. Wondering if this is just par for the course with gym tools or if there's something else out there that doesn't drive everyone up the wall.