If shoulder day is on the schedule and you're aiming for real size and development, the TGrip bar deserves a spot in the workout.
Form matters most on shoulder work — more than almost any other muscle group, since the shoulder joint is inherently less stable than something like the hip. The neutral grip keeps your shoulder in a natural position throughout the lift, reducing strain on the tendons and ligaments that take the brunt of bad form. That makes it a solid option if you've had a shoulder injury before, or if you're lifting heavy enough that the joint is under real stress.
It also opens up variations a straight bar can't do cleanly: front raises with a neutral grip, an outside cambered grip, or an inside cambered grip, each hitting the front and medial deltoids slightly differently. Upright rows work through a fuller range of motion too, since your hands and arms aren't fighting an unnatural position the way they do on a standard barbell. And it handles shrugs well, so traps get worked alongside the shoulders in the same session.
Add it to your shoulder day, keep your form honest, and you'll notice both the reduced joint strain and the results showing up over time.