No doubt the Jupiter team including the CEO @Jiten is active in this community and they also give you updates of their future releases in this community before making it public.
And about the customer support I can only say they are better than Fi customer support and most of the time a representative assigned immediately to resolve your query in the chat support section of the Jupiter app.
As part of Jupiter UPI, it does take the same amount of time as any other UPI channel.
But the UPI in Bullet which is a UPI based credit app from the developer of Jupiter is far better and faster than any UPI service providers currently present.