The Porter Port does a fine job of gripping. Not as much grip as the R1, which I find to be overkill and I worry it will damage the plating on the prongs on my $$$ power cords.
If you liked the T3, you should definitely try the Teslaplex. Many SR dealers will offer you one on trial. If you want the name of a great SR dealer, email me.
For $36, the Porter Port is a no-brainer, even if used as a base-line to evaluate power cords and other receptacles. Albert Porter is a fine man and he has a right to be proud of the Porter Port.