I use something similar for Aolani. It’s called the comfort trainer. It was recommended to me by Jackie and Mandy because it’s a slightly better fit for a maltese. It really does help control him on walks.
Were they saying to get the Gentle Leader Head Collar or Front Clip?
If it's the front clip I recommend the Sense-ation Harness. It fits better and is way easier to adjust and put on than the Gentle Leader.
If it's the head collar I recommend the Comfort Trainer. The nose piece is much nicer - it's a rolled piece of fabric instead of a flat piece. It again, fits easier and is easier to adjust.
They both work great for training. I would usually start with a front clip and if I had to move to the head collar. The head collar is really great for reactive dogs and large dogs. The front clip is great for any size and helps if they pull.