Metro by T-Mobile

Do anyone have metro by T-Mobile? I have T-Mobile but I’m trying to cut back on spending and my bill is $116 , metro by T-Mobile is offering $60 phone bills . The only thing I’m worried about and keeping me from switching over is the service . My service with T-Mobile is never slow , but boost, cricket and metro all have slow services once it get to the end of the month . My brother has boost, pays for unlimited but at the end of the month (closer to the next billing cycle) if hesout of wifi he has to end up using someone’s hotspot to get on social media or play music in the car