I shoot a Carter but, I also have a Max Pro4...
Is it as smooth as a Carter? No, but that's not really a fair comparison, especially considering the price difference!
My Max Pro4 has proven to be a very good, reliable adjustable thumb-release (my son now shoots it)...it's an excellent choice for someone making the transition from a wrist-release to their first thumb-release (it was my first thumb-activated style release).
It does take some getting used to, coming from a wrist-release, and will change your anchor. Once you get used to it, and start using back-tension, you will notice a marked improvement in your accuracy, and you'll wonder how you ever shot a wrist-release!