Gianella reviewed the Pen Pal 4-in-1 Makeup Pen by Alleyoop and had mixed opinions about its performance. While she found the pen to be flimsy and not suitable for eyeliner, brow liner, or highlighter, she was impressed with its lip liner function. Gianella found it easy to use and appreciated the twist mechanism that dispensed more product. She even suggested keeping the pen solely for lip liner purposes. Overall, she recommended giving it a try for lip liner and encouraged others to share their experiences with the product. Despite its limitations in other areas, the Pen Pal 4-in-1 Makeup Pen by Alleyoop seems to excel as a lip liner option.