I'm going to be the bad guy here and toss the wet blanket.
First the good. Vescovi obviously is a fantastic ball-handler, and at the guard position, that is probably our most glaring, current weakness. He immediately helps to address that. He can also add some shooting ability to the perimeter, as well. He has a very good eye and understands how plays develop and where guys should be open.
Now the bad. The more I watch, the more out of control he seems to be in a lot of what I've seen. Keep in mind, we are seeing the highlights in these videos, not the times when balls sail out of bounds and he gets shut down by overdribbling into the paint on an ill-advised drive. Barnes isn't going to stand for the half dozen TOs that will result from some errant no-look passes and over-dribbling. His release isn't very quick on his shot, nor does he have the requisite height to compensate for a slow release. He seems to be the kind of player that would most benefit from developing chemistry with his teammates to know when and where they are going to be on the floor. Being thrown into the fire will not allow that to develop this year, most likely, so you may see a neutered version of him this year while that chemistry develops.
Overall, he looks like a wonderful addition, and over time his good should far outweigh his bad. All of his flaws can be coached out of him if he will allow Barnes and staff to coach him hard. Jordan Bone had a lot of similar flaws in his game when he got to Tennessee, and they made him an NBA draft pick. This kid is further along than Bone was at 18 years old, but Bone took to hard, honest coaching like a duck to water and it made him a much better player.
Can't wait to see SV in a Tennessee uniform this spring.