I've seen a few of his starts, and have the opinion that that he's nowhere near where Berrios was as a prospect, based off the following:
His fastball is in the range of 88-93 mph, sitting at 90-91. It's a below average pitch. His changeup has good depth and fade, and tunnels well off his fastball, sitting in the low to mid 80s. It's an above average pitch. His curveball has really good vertical movement, but it's easily recognizable out of his hand. It has the potential to be a plus pitch, as it can get swings and misses, but for now it's getting knocked around too much to be anything better than average. His slider sits in the low to mid 80s, and he seems to struggle with commanding it. It's a below average pitch.
His mechanics are very concerning. His front hip gets raised too high above his pelvic plane in his delivery, which results in his plant foot getting down late and his hips staying closed too long, resulting in poor hip/shoulder separation, an inefficiency that hurts his velocity. Additionally, his back foot leaves the rubber too early, and he has no ankle eversion that you see in the most efficient throwers such as Gerrit Cole and Jacob deGrom. His throwing arm action is too long, with his hand extending well below his back hip and having a wild spiraling effect that will likely lead to injury. He does a good job of keeping his scapulars and arm on plane at the point of his release, but with his exaggerated over the top delivery, to accomplish this he needs to curl his spine towards the first base side of the rubber, which combined with his glove side opening up too early causes him to fall off towards first base and away from the target, which is another cause for the lower than expected velocity.
He's well filled out for his frame, which is promising, but with as many mechanical inefficiencies as he has, it's going to be a long road ahead before he can reach his full potential, in my opinion.